I too recently have taken the 6-max plunge and am loving it. I found much looser/more passive games than full-ring, as others have said it helps your short-handed and HU play when playing full-ring, and you get to play more hands and see more scenarios. Here are two posts from MrWookie that lay all this out very well. These are must reads if you're gonna take on 6-max.

Six Max Baby Steps

Pooh-Bah Dissertation - 6 Max Stats FAQ