I bought a new Hisun Sector 750 in Jan. 2021 mainly due to price and features. I also bought a plow with it to clear snow from my 350' driveway during the 2021 winter since we couldn't go south due to covid. Like Alien10 I use it primarily to haul firewood on our 75ac property and although licensed and insured I rarely take it out on the public roads. I don't abuse it but don't baby it either. I've used the winch a lot to haul large logs out of the bush to where I can easily cut them up and haul the pieces back to my wood pile.
Other than the first winter, it's stored in an uninsulated shed in the winter - only storage prep is to add and circulate sufficient fuel stabilizer. I've left the battery in and cables attached - so far it has fired right up in the spring. I have about 75 hours on the clock.
As for maintenance, other than oil changes, I've been fortunate - just an issue with steering last spring when it would suddenly jerk to the left while driving in a straight line. It was an intermittent and baffling problem. Also fortunately I found a sales/repair shop 10 miles from me that also handles Hisun and they were able to solve the problem.
All in all, I've had a positive experience with my UTV and it's doing what I need it to do. YMMV