There's feedback alright. The buttons are integrated into the mouse surface, ala Logitech's MX500/510/700/900/1000, and there's a speaker that makes a clicking sound when one of the buttons is pressed.
If I didn't already have an MX1000, I'd be interested in the Bluetooth variant. Actually, I might have to buy a Bluetooth version of this thing anyway, since I take my laptop to classes.
Turns out that's not quite true. Check out a review. But it's even better. Like their old mouse, the whole shell depresses with a real click, but apparently the pressure sensitive buttons tell which finger you used to do the click. It apparently takes some getting used to the faint feedback on the side buttons.
Apparently pressing the whole mouse as you would the old Mac mouse does a left-click, which is why they said it can be a one- or two-button mouse. You'd never know the difference unless you purposely pressed only on the right side.