I work for a school maintanence dept. and we bought a 2010 400 ranger this year to use. It has 40 something hours on it.
I like it.
I considered buying one myself. (like you, it would fit better in the means of transportantion I have available)
The reason I'm thinking of going with the full size ranger is, I think the 400 would need more power to carry six people around like I plan to do.(up hills on rough dirt roads)(or possibly sand dunes)
The 40 mph top speed sounds pretty fast to me. Ours has never been driven that fast, but I believe it would go that fast.
I would buy one, if I was planning on only carrying 2 or three people.