I have one of the MP721c's, and the colour wheel is very slow. If you glance at anything quickly you see fantastic rainbows if your eyes are sensitive to things running around 60hz -- the price is pretty much the same, so I would suspect the 622c would use nearly identical parts.
Let the hive mind of Engadget get that for you.
"I'm heading to university next year, and I've purchased a MacBook. I'm also taking my four year old desktop, just in case I'm left with no computers when the MacBook is being repaired or whatnot. With only two USB ports on a MacBook, I want a Bluetooth mouse. Budget is about $100, and of course, it needs OS X support. Thanks for the help!"
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