I just picked up Faithless' outrospective... It was on sale for really cheap at a CD store. I've heard some bad reviews of it... but to be honest I kind of like it. Sure it isn't nearly as good as their earlier work. But it has some good songs on it. (We Come One is up to the level of Insomnia, IMHO) So if you see a copy of it for fairly cheap... don't believe the bad press and pick it up.
Anyway, the thing that I noticed about it is it seems really well recorded. A lot of clear sonic detail and a good soundstage. It reveals the flaws in my set up... I'm sure it will sound even better when I finish my system upgrade.