I agree my Vorrezensenten to predominantly, but I've only had positive experiences with the MX 900th
Here is something for macuser:
I bought a MacBook Pro 3 months ago and to equal the MX 900, because it can communicate directly with the laptop and I did not want to clutter or a big receiver. This I have found all the way back to my desk, because the batteries (normal, exchangeable AAs) keep a long time.
The mouse is fully compatible with all Macspielereien as dashboard etc.. In my work all buttons and features, even if the SetPoint software is not compatible with Mac OSX.
Also, I think they are suitable for gaming, as I with such (Unrela Tournament, Call Of Duty 2) nothing negative noticed.
Letztzendlich convinced the design of the mouse (and the station), which looks very classy and also appears to be of high quality.
So I forgive on the MX 900 5 star and can also Macusern that have a Bluetooth enabled Mac, the thing advised to buy.