In a word RE-READABLE (Score 1)

Most of my SF book collection doesn't get a second round, with the exception of Banks (and a small number of others). Like others I'd say start with 'Player of Games', 'Consider Phlebas', 'Excession', or for something a little darker 'Use of Weapons'. I find the first read through is rushed just to finish the fast-paced parts, and a 2nd or 3rd read to savour some of the imagery and situational positions that Banks as assembled. The humour is distinctly British as well! "Matter" hasn't quite got the snorts of humour that some of the other books had, but the imagery and plotlines are right up there.