Chinese scooter are really all you can buy in the 50cc market without paying a lot of money for a Japanese bike.
Many European makers actually use the same Chinese engine so no matter what brand you buy, its Chinese engine.
They are very good OHC units and very simple to fix but some of the cycle parts are well thought out for fixing with minimal tools.
A lot of odd nut sizes with 7mm,12mm,14mm in use plus the Philips screws instead of posidrive.
I liked the self bleeding master cylinder that needs no tube attaching to the caliper.