I must admit that of all the GM bats I do like the purist - it looks like a forgiving bat with what I'd guess is a massive sweet spot!
I bought the six6 as a match bat(it's an original) and the purist as a back up(it's a 606).
Although the purist is a tad lighter on dead weight, the six6 feels lighter on pick up. Not sure if that's the effect of concaving, sharper spine on the six6, over the not on ounce of concaving and chunky back of the purist.
The purist does seem to have a longer middle though, it starts lower on the bat, and seems to go as high as the six6s middle.
All this is through mallet and bouncing a ball, I've not had chance to net with either yet unfortunately.