Got my G13 2 days ago and I love it. In addition to a Xkeys 128 and my MX Revolutions mouse (with lots of thumb buttons) it is superb.

Another superb thing is, that I can reuse the macros of my G15 (classic) and the macro name is displayed in the screen.
The new Logitec software is also cool, Give it a comprehensive macroname and you see a verification in the display that you pressed the right button (e.g. Self AOE, Pet Attack, Call Back Pet ...) instead of checking the screen that the pet does what you thought it would do

I tried to use my N52 for like 2 days then I put it in a corner never looked at it again, because i didn't feel comfortable with it.