G&G's aren't bad if you get their quality stuff.
However, buying their low quality shit (Which I had made the mistake of doing) its a rediculous hassle to actually personalize. I had amos work my G&G Rec AK into a peice of art. But everything (Seriously) everything external had to be replaced.
This is what my G&G AK started out as. I literally had to ditch EVERYTHING but the dust cover, selector switch and trigger guard to make it into this:
Full metal and wood externals. Which is composed of a TM front end (The outer barrel assembly on the G&G is NOT compatable in any way with TM parts) and G&P externals. I could have easily baught a RS AK47 for the costs and hassle to have this thing put together. But Amos' wonderwork made it very worthwhile. Its now a part of my collection that won't be parting any time soon, if at all.
Either way, if you have no intention to do anything to these rifles in the future they're alright, its best to get the Top Tech over the Combat machine crap.
Also, here is one of G&G's higher end AK's, which I just recently sold. There is a 'huge' quality jump between their rec crap and what they actually put effort into.
So, I'd just say "Buyer Beware" when it comes to purchasing anything from G&G, just make sure you know what you're getting into and what version of G&G you are purchasing.