I can only endorse Werthead's comments. Adam is a genuinely nice guy and brimming over with ideas and opinions. He's actually a very exciting and innovative writer, but one problem with his novels is that he does like to use them to experiment, both with narrative style and with content, which means that sometimes his novels jar with the reader. I haven't always loved them.
His short fiction, on the other hand, is invariably excellent, and I've been fortunate enough to commission and publish stories from him a couple of times... Three, now I come to think of it: two for NewCon Press anthologies (Celebration and disLOCATIONS) and one for a BSFA Special Booklet.
As an aside, Adam also spent a great deal of time in recent years compiling the new 'music section' for John Clutes imminent online reissue of the Encyclopedia of Science Fiction, which he had great fun doing.