I've been using my 7000 wireless for approx. 4 months now and have had no problems with it at all. In fact, I'm delighted. I use the computer 7+ hours a day so the keyboard has had pretty heavy use. I find the positioning extremely comfortable. It took me just a couple of hours to adjust to the shape of the keyboard and now I can't do without it. The keys have a nice touch - positive but not at all "clunky". I like the feel and positioning of the mouse better than my previous logitech ergonomic mouse. It's solid, reasonably heavy but glides perfectly well with little movement on a mousemat. Performance of both deteriorates when the batteries get low but there are warning lights that tell you when battery level is low. Batteries last for me approx. 2 months.
Only quibble is that 3 of my letters have started to rub off already - as a touch-typist this isn't crucial for me, but if you don't touch-type you might want to bear that in mind. Keyboard and mouse travel every day between home and work (in a musical keyboard bag!) and are none the worse for wear. The keyboard hot keys are useful - mail, web, volume, and my particular favourite, calculator. Overall, I'm extremely satisfied and have found these to be great value for money.