Summary: Nice keyboard design and good quality but Space bar is too hard.I purchased 2 of them and I thought the problem was mine and I switched with the other one and same problem. I used for a while then I had to go back to my old keyboard. I wish Logitech have a recall for this keyboard to fix this problem because I really like the design.
Summary: I bought this keyboard because it was wireless, had assignable keys and had an ergo shape. The wireless keyboard functions very well, and I've NOT experienced any of hte freezing and hanging that others have reported. The Unifying receiver is awesome. Everything functions as advertised and as expected. However, the layout of the keyboard is clumsy, as others have mentioned.
Summary: HORRIBLE performance. I like the curve, very comfortable, nice key strokes but I honesty thought I was going crazy because I couldn't imaging that any company would manufacture something that is this erratic! In the middle of a sentence it just stops typing - then randomly starts again and inserts a mixed collection of the missed keystrokes ... or prints one letter clear across the page ... or the backspace/delete key won't work.
Summary: I bought this keyboard after recently purchasing the M570 wireless trackball (which I LOVE!!). The keyboard, however, leaves much to be desired. It has a great feel to it and nice multimedia controls, but there seems to be a connectivity issue, especially when paired with my trackball. The keyboard would stop responding for a while sometimes, or add extra key strokes at other times.
Summary: I am typing this review with this keyboard and the letters are popping up a few seconds after I type. This delay makes it nearly impossible to use for gaming. It's not a transmitter problem because I have a Logitech mouse too, and it works great. Most of the functions don't work with Mac. I need a new keyboard!
Summary: Very BIG, function key are grouped by 3 which I didn't notice at first, it's a disaster using with a norton commander clone! Keyboard quality is good as usual with logitech material but ergonomy is the worst I ever saw...
Cons: Wrists hurt after 5 minutes of use. There really isn't much to the ergonomics of this keyboard, just a VERY slight curve that makes it "look" ergonomic. If you've every had problems with your wrists, give this one a pass.
Summary: Lousy compatibility with the Mac and no support, you're on your own. Ergonomics are not the best either... Would definitely not recommend, the only plus is the wireless but most functions don't work on a mac. Wish I had looked at these reviews before I bought, but trusted logitech and their good reputation up to this point.
Summary: seems to work ok for normal web and pc use. But when playing games it just stops responding and you die! Not sure what else to do. Have the latest sharepoint and still does it. Perhaps wireless was not a good choice. I would trash it if I had not spent $50 for it.