I actually knew that. With the old Trackpad that had a separate button, however, you could move (on the trackpad) and click (on the button) at the same time. The new version (i.e. button integrated/under the Trackpad) looks cooler and seems slicker, but is far less usable to me.

For example, Try sweeping to select a block of text and secondary clicking (either with two fingers or at the bottom right/left designated corner) at the same time. Fluid to do with a Trackpad w/separate button, even easier with a standard two-button mouse (can right-click while moving the mouse), but far slower with the new integrated trackpad. Now try doing it repeatedly 2 dozen times in a few minutes and you’ll probably see why it grates on me.

http://www.businessweek.com/idg/2010-07-27/first-look-apple-s-magic-trackpad.html

It took me a few days before I became more facile with the trackpad than the mouse and perhaps some people never would like it as well as I do.

“Any sufficiently advanced technology is indistinguishable from magic.”
Arthur C. Clarke, “Profiles of The Future”, 1961 (Clarke’s third law)

I like the styling (very similar form factor to my Apple Bluetooth keyboard), but if it operates in the same manner as the Multitouch Trackpad built into my new Macbook Pro, I’m a bit skeptical that it’s the “future of the mouse.”

I actually hate it. I constantly find myself frustrated when I want to move and click at the same time. While a normal mouse (or even a laptop with a conventional touchpad (or joystick-nub) and separate click-button) allows that to happen in one smooth motion, my MBP’s Multitouch Trackpad seems to require two separate steps — which is a lot slower, especially when “secondary clicking” or performing repetitive actions. I so wish I could revert to the Trackpad/separate button in the older MBP models…

That said, I’m sure a lot of them will be sold.