Sounds like the ATP's are holding up well cause I can't find much at all about these quads. Usually most posts are from issues or something else.
My new to me 05' seems to be a good one so far. I will keep y'all posted on how she works for me. I can guarantee it will be hauling a few deer out of the woods this season.

 

I have 05' ATP330 , its' been flawless so far .

 

Hey! That's good to hear about the ATP330. Did you buy it new or used?
I just noticed my rear axle is slightly leaking 90w oil so I ordered a $7 seal for the left side.

 

I bought it used a year and a half ago with 58 miles on it !