I think this is probably the best product amongst wireless keyboards you might use with a living room PC, though the only other I've tried is the Microsoft Remote Keyboard for Media Center. The problem with that keyboard is its awful pointing stick; though it does get more flexible with use, it's not nearly as good as the pointer sticks you find on IBM Thinkpads.
This keyboard has good key feel, a built in pointing device, and is a nice size (about 8.5x11) for the couch. Unfortunately, it sometimes, and often enough to be annoying but not enough to be unusable, stops responding. Missing a keystoke or two, or not responding to your touch on the pad. A second later it will start acting normal.
I have this behavior even with 100% fresh batteries, and I'm not mistaking it for the auto-sleep function. I mean, you'll be typing, and it will stop responding for a few seconds.
Perhaps this is a wireless issue; it does use the crowded 2.4ghz band and I live in an apartment and run a wireless network. Then again, I figure that's true of many people who would buy this product...so it'd be nice if they could design around those impediments.
I suppose it's also possible I have a defective keyboard, but enough people have commented on this as a problem that I suspect it's just the design.
So. Works pretty well, but I'll have my eye out for any new products in this vein...
***UPDATE***
I contacted Adesso about my problems and they suggested that I return the keyboard under warranty. Doing so was fairly painless, it took a week out and a week back (UPS ground, I pay to get it to them). But: new keyboard still has the problem of intermittent response. It seems to me that having it on my lap or on a flat surface like my ottoman blocks the transmitting antenna; it seems to work fine if I hold it with just one hand and type with the other--but that's not a very usable operating position...