I use the magic trackpad on a 27" iMac, it is a wonderful input device and exactly fast enough. There are always clueless users who don't know to adjust tracking speed just like there are always clueless Apple haters who want to believe that Apple would not have provided a tracking speed preference control to allow users to tune devices to their needs.
I have tried many times to correct the mouse acceleration curve on OS X, including by installing 3rd party software. So it's much more likely that there are a lot of clueless Apple users out there who don't realize how unproductive they are with such a poorly designed input system.
