Too squishy, too much key-travel, nothing close to the Apple aluminum keyboard. I just wish Apple made a backlit desktop keyboard of the aluminum model.
I use it since 2009 with my Mac Pro and it's awesome ! It's the best keyboard I've ever had. Very comfortable and you can type really fast. Beatuiful design, a little bit heavy so it won't move when typing. Definitely much better than Apple keyboard.
I used a lot of high end Logitech keyboards but this one is the best of them. Enter key is a little bit moving after 3 years of usage, but sometime I hit Enter very hard
Grab Logitech Performance Mouse MX and you will have a perfect pair !