I purchased the wireless keyboard at first, thinking that it would be nice to rid myself of some clutter on my desk.
What I didn't realize was that the wireless keyboard is much smaller than the wired--there is no numerical keypad on the right hand side and is way too small to be comfortable typing on it. (It's the exact same as the MacBook keyboard, I believe)
I would suggest going with the wired version, which is a full keyboard...it's a low profile, but I like it.
I have both wired and wireless.
I got the wired one with my Imac and loved it that much I bought a wireless one for my macbook when its plugged in to an external monitor at home!
When I use the wireless one, it does feel a little naked as it doesn't have the numeric pad, but I rarely use that anyway and the sheer smallness and practicality of it is just superb!
The profile of the keys is fine, but I don't like the feel of the keyboard. It's even more unforgiving than some low-travel laptops and while I think it's definitely an improvement on the crap previous keyboard, I like it lot less than some of the competing scissor-action keyboards on the market.
I only have mine less than a week but I love it. It took a couple of days to get used to it though. I do have problems with the space bar not taking but I think that's just me typing too fast and not being used to it completely.
It looks great and feels great.