I've only ever played the original version, not the new one. The modular bulkheads for it are amazing. I got given a copy of the base game by a friend, having managed to get my hands on the expansion cheap. The original game goes for like £100+, which is nuts.
It's one of the best tabletop squad based shooter's I've ever played.
I've still got my original Spyrer gang, and have managed to get my hands on a couple more of the standard gangs too.
With the smaller gang sizes, it was one of the most affordable GW games ever I think