Transition is....an odd one. Overall I think my impressions were positive (at least, I at no point felt like putting the book down and was curious to see how it would conclude), but it's not one of his best. The conclusion seems a little....rushed. It's all set up prior to it happening so it's not exactly like he just pulled the resolution out of nowhere, but it just seems rather anti-climactic. Also, without going into spoilers, one character starts exhibiting rather odd abilities with no explaination given, and a viewpoint character (who I thought was the most interesting character in the book) seems like he could almost have not been in the book at all, given how little he's actually used in the resolution.
Against a Dark Background was better than Transition, I think. It had an interesting setting, an entertaining plot that didn't stick around in one place too long, and a good little twist at the end. Also, the Lazy Guns seemed like something that a Culture Mind with a twisted sense of humour would create. My only real complaint was that the characters came off as rather bland.
Also, I was passing by the library today and managed to pick up The Wasp Factory (along with the novelisation of Jurassic Park, which I haven't read for years but recall being much better than the movie). I think I'll read that one before I start Inversions, since it's a lot shorter, and I've not read much of his non sci-fi works.
Also, I think it's time for a thread title change, given how we've moved away from the original book in question.
"You've all been selected for this mission because you each have a special skill. Professor Hawking, John Leslie, Phil Neville, the Wu-Tang Clan, Usher, the Sugar Puffs Monster and Daniel Day-Lewis! Welcome to Operation MindFuck!"