Have been on the trails quite a bit and the two bikes are great. The EFI is amazing. I love the chokeless starts and the response time is immediate. Got it stuck in snow though. My father wanted to try it slowly in Low gear in two feet of snow to see but he didn't get too far. But it is very good in snow (when my father's not driving) on High 4x4.

I'm a little disappointed in the 600 only because I have the 700EFI sitting next to it. Yesterday it was around 0C (32F) here. The 700EFI starts like nothing but I have to stand next to the 600 for 6-7 minutes and press the gas a little or it will stall. This shouldn't happen when it's not very cold. On the trails, it is sluggish without full throttle for 5 more minutes. It sort of feels like when your sled needs a cab cleaning or kit. Once it gets going good, I can't notice much difference between both bikes. I do think I should have spent even more and gotten 2 EFIs but that's just being greedy, as long as I get to drive the EFI and leave the 600 for my wife!!

 

One more thing, the EFI is much better on gas...had to refill the 600 way before the EFI.