Erndog,
The Apple Store should have it right when they say you need OS X 10.6.6 or later. You can double check at the designer's link above.
Bpopman,
No, sorry, it doesn't work with AirPlay. But it will respond to my iPod Touch as a remote using the built in AirPlay from my iMac.
And yes, it sounds great. At least to my ears.
All the best,
Nonoise