Well I have no point of reference really, my first UTV. I ruled out the Mule because it had an axle on the rear and I wanted better clearance. I have a lot of limestone outcroppings (central Texas Hill Country), so I wanted clearance above all else. The bottom of the Volunteer is basically a skid plate, which is what makes oil changes difficult.
Not saying its any better than a Mule, only saying that was my thinking. I had narrowed it down to a Cub Cadet and a Gator, but I have a John Deere mower (LA120) and have been very disappointed with the quality. I probably would have gone with a Gator anyway but my Dad was the one who was buying it for me (well for him, but on my property) so I deferred to him.
The Volunteer is very solid, the only problems in 2 years (170 hours including lots of kids driving and lots of rocks), are ... (1) One end of rear stabilizer bar came loose, doesn't seem to affect anything but I'm going to get it fixed. (2) Pin came off of electric dump bed lift, $2 fix. (3) Something is rattling with the steering, may be nothing, I'll have the dealership look at it. (4) And since it was new I have never been able to get the gear box into low range, something wrong with the linkage or maybe the gearbox has a problem, but I don't really need low range so its not an issue. I will have dealership look at this also.
I should point out this was a tricked out demo model, sold to me as new but with some hours on it. It has the larger Kohler engine, 31 HP as I recall. It drinks gas, not fuel efficient. It has never failed to start or operate.
The dump bed is somewhat flawed, if you fill it full of dirt/rocks, dump a load, then you can't close the gate because pebbles fill the gap and it takes 10 minutes to dig them all out. And it's just not a very big dump bed, so I don't ever really use it for anything except hauling stuff around.
Frame is very solid. Lots of lights but it needs a cab light so you can find the switches in the dark, no lights out back.
That's my quite review of the Volunteer. How do you like the Mule? I don't think you can go wrong with a Mule.