Milo,
My wife and I bought an '07 Mule 610 back in August. Since then, it's got 40 hours on it. It's a solid machine and I think you'll be happy with it. We paid 6300.00 for it out the door and bought it in Lagrange, Georgia. Since I have a "4-wheeler" already, it was the rational choice for the more strenuous chores around here.
My neighbor has one, he bought it used a few years ago...it's beat to heck (appearance), but runs like a champ and he says he's never done anything to it but GAS IT UP

! I took that as never doing ANY maintenance on it...he said I was correct. I don't agree with not doing proper preventive maintenance IAW the owner manual, but it's a testament to how tough it is!!!!.
He uses it daily for chores around his farm.
Since getting ours, another neighbor has purchased one. They love it, but have a loud sound coming from the engine/tranny area when in low gear and 4x4. If they aren't in 4x4, there's no obnoxious sound...they have already scheduled it for service work at a local dealer... the warranty will cover it.
Here are some "issues" about the machine, but by far...not mechanical problems:
-The brakes are good, but yes, on steep inclines, they do require a little more force. Hey, if my wife can use them with no problem with 400lbs of horse feed in the bed, anyone can!
-It's a little "cold natured", but using the choke on the first start of the day and subsequent starts if it's been a while since it ran, (even on warmer days), solves the problem.
-Sometimes after the first start of the day, it doesn't want to go into reverse or high gear. After doing a little reading around the 'net, I found the solution: If it doesn't want to go into gear, don't force it, just rev it up once in neutral, let it rev down, then it'll go into whatever gear you want. Still, not a problem, just annoying sometimes.
That's it. Most are not really issues in my book, but felt you needed an honest appraisal. If I were in the market again, I'd buy another one.
It's a great machine and in 4x4 and low gear it's got a lot of torque and I've yet to get it stuck, but as we know anything can be stuck!
We have steep hills and a creek on our property. It performs well on both terrains.
Good luck and for the money, it's a good choice.
Podunk