The club I ride with has numerous members with the CFmoto SxS and I haven't heard anyone having any problems. One member had over 1000 miles on his 2017 and not a bit of problems. However as we all know there are always going to be some that have problems. For instance:
I purchased a 2017 CForce 500s in March of 2017.
Took it out for the first time and when I got back checked the oil, it was low. Took over a quart and it still wasn't full. Took it back to the dealer and they checked it out couldn't find anything wrong. They suspected it wasn't filled at the factory.
Weather turned warm and I could feel considerable heat coming from between the top of the clutch cover (right side) and the faring. Had the exhaust wrapped still hot, it got so hot one time that it blistered my right leg (I suspect fan issue) Bought a pair of high top boots, fixed the problem.
July took up in the mountains weather was cool (low 40's) engine was hard to start but one I got it running didn't have any problem with it for the rest of the day. Restated numerous times. Starting having more problem with hard starting the first time. Sept 2017 engine hard to start but got it loaded, when I got to the unload area it turned over but would not start no matter what I did. Took it back to the dealer and it wouldn't start for them, had to push it off the truck. Two days latter they were going to look at it and it started right up. They kept it until March of 2018 and no matter what they did it would always start, even when it was outside in below zero temperature.
Problem was resolved with me when the dealer agreed to give me a trade-in value way above book and sold me a 2018 Suzuki 500AXI King Quad below normal dealer price. Oh he agreed that he wouldn't ride it out in the boonies and trust it not to leave you stranded.
We have a couple of other 500s owners in the club and they have not had any problems. Note Can-Am's also have this problem but I don't think it is a sever. Polaris has same issue but they had a fix for it.