There are mice and there are trackpads. Since Apple revamped what it meant to be a trackpad, many mouse users have flocked to trackpads, with all their touch gestures and non-moving hands. You may call that growth; I call it laziness. I don't hate touch gestures, far from it. I use my iPad and never touch the home button thanks to the magnetic on-off switch from my case, switching apps with a four-finger swipe up, or closing apps with a five-finger pinch. As much as I like pressing\u00a0physical buttons, I like doing things quickly and efficiently more. Compare this with another small mouse in our Mad Catz Eclipse Mobile mouse review.\r\n\r\nTouchpads just aren't there yet. Not on OS X, and certainly not on Windows 8. With the former there are a lot of great gestures but the customization options are ridiculously limited (and limiting). For the latter, by itself the touch gestures are few and far between, but with a good hardware\/software maker you can have a ton of nifty features with a lot of customization. Compare this mouse with our Logitech M570 Wireless trackball review if you're still not sold by the ultrathin. The problem is having the capable hardware and compatible software...all in one machine.\r\n\r\nMore to the point, regular mice are far more intuitive. We've all used them for decades, and they work really,\u00a0really\u00a0well. They've gone through a serious maturation process, all the way back to the 60's. High-end mice range from 30-button monstrosities to very sharp, very powerful devices, many of which Logitech has built. As I write this review I'm using the Performance Mouse MX, which has so much great hardware that it's impossible to deny that the mouse is king.\r\n\r\nTouchpads, however, will have a place once the OS's of tomorrow become the OS's of today and software makers wake up. In the meantime, Logitech gives us the Ultrathin Touch Mouse T630, a travel-size mouse very similar to the Microsoft Wedge Touch Mouse except that it's way better shaped, far simpler to use, and works on any computer, regardless of operating system. In other words, the T630 is the first step into a proper touchpad mouse.\r\n\r\n\r\n\r\nThe first thing you notice is how clean the whole thing is, almost to a fault. Logitech ships the T630 in a practically-sterile clear hard plastic box (see image above). It's a gorgeous display, and after you look at the T630 up close, it's a gorgeous mouse too. Supremely thin, beautifully shaped with sleek, sharp lines and an incredible razor-thin black top over an aluminum undercarriage. It looks more at home on a racetrack than at a workstation or beside a laptop.\r\n\r\nRidiculously clean and tidy, the Ultrathin certainly lives up to its name. It's tiny at just over an inch thick at it's thickest point. When Logitech says it fits in the pocket, they aren't kidding; I took it with me to work and, rushing out of the house, threw it into my pocket before a doctor's appointment and didn't realize it was there the whole time. Getting in and out of the car, going face-up and face-down on a table, and changing seating positions at least a half dozen times. That's after I took out my phone, keys, and wallet. I didn't even remember it was there.\r\n\r\nSmall size isn't everything. One of the problems with the Wedge was that it was awesomely small, but the dimensions weren't uniform whatsoever. Not the case with the T630, but it is very small and tough to recommend for using more than two hours at a time, especially if you're using the mouse a lot. If that's the case, stick with a larger mouse like the Performance Mouse MX. However, the T630 is very comfortable and I enjoyed using it a lot, both traveling about and in the office.\r\n\r\nLike a number of Logitech's latest products, the T630 has a Bluetooth switch so that you can assign it to multiple devices, in this case two. The switch, on the bottom of the mouse, isn't the most useful for a mouse. While keyboards work for just about anything (computers, tablets, smartphones), mice are mostly unnecessary on "smart" devices, though most versions of Android do support it. I found it helpful as someone who bounces between multiple computers. If you travel and have to use someone else's computer for any reason, the ability to set it up properly without disabling your own machine's Bluetooth settings is convenience reborn.\r\n\r\n\r\n\r\nThe only part that was difficult to test was the battery, which has lasted over three weeks without the need to charge. Logitech claims that a minute of charge from completely empty will give an hour of battery life. Based on Logitech's claims on battery life from previous products, I believe them. The placement of the USB connector does prohibit using the mouse while charging however, which is a strange choice. Considering the size of the mouse however, using it while plugged in would be difficult because the cable would cause too much negative force and make using the mouse uncomfortable.\r\n\r\nAs a "Touch Mouse", the Ultrathin works tremendously well on all three major platforms: Windows 7, Windows 8, and OS X. Once users install the included software, a number of swipe gestures become available for customization, each limited to what the OS supports. On Windows 7, gestures include back and forward, opening the start menu, switching applications, hiding the desktop, and basic scrolling functions. Two additional gestures exist for Win8, opening the charms menu and displaying the app bar. OS X has much more functionality that includes all of OS X's gesture commands with limited exception.\r\n\r\nAfter a day of use, I thought I loved the T630, but I couldn't shake the feeling that something was missing. On my MacBook Pro I realized exactly what that was: the inability to tap instead of click. As much as the Ultrathin Touch Mouse supports touch, it only really supports touch gestures, not tapping. Users can't tap to click, or two-finger tap for a separate function. Every machine, Windows- or Mac-based, support basic tap features, but the T630 doesn't. As far as any touch mouse goes, that should be a requirement, or at least something that users can set and customize.\r\n\r\nThen again, the Ultrathin Touch Mouse T630 is the best touch-sensitive mouse ever built. By a longshot. You could point to the Apple Magic Mouse as an ample competitor, and it certainly is, but the feel and design never broached the threshold of "yes, this is the mouse I've always wanted." Logitech's T630 (and T631, it's albino twin brother) does. The fact that both models work on any of today's main operating systems is already huge, and that the mice work flawlessly on any machine is a testament to just how well built and designed they are. It's the first mouse that even made me think that could incorporate all of the touch features of a trackpad straight onto a moving mouse, and let the user decide what they like. It's a glorious step forward.\r\n\r\nBottom Line:\u00a0Good luck finding a better travel mouse. This blows everything else out of the water, no matter what kind of computer you have.