I have the 4 seater. Bought it because I have a family of 5 (yes, I can fit 5 in a 4 seater). Most of my trips are with 2 seaters and there has never been a place I can't go that the 2's go. I climb hills better, go through whoops faster, power slide better, and can take more people with me. On razor backs there is the occasional extra point turn but rarely.
I would high center more often then the 2's but when i hammer it down I just slide over.
If i was in the market now I would do the 1000 4 seater but not trading in my 4 seat XP for one.