I bought a Loncin Generator 2.5Kw in 2012 for 28500 including natural gas kit. With wheels and battery trolly and everything.
It got it's valved jammed within a year, 1500 for new valves and valve seals (probably it happened because I didn't get it's valve clearance adjusted)
Since then it is running perfectly, overnight (12-14 hours) outdoors, the sound changes after 7-8 hours but I never turned it off unless it turned off itself from running out of oil.
It developed an oil leak so every 10 days it requires about half liter oil refill in summer, I changed its oil once or twice a season, didn't follow any change by XX hours schedule and yes never got it's valves adjusted either. Probably it ran 30-50 hours a week on average in peak summers.
I had option to go for Honda or Yamaha generator for thrice the price, they are bulletproof built yes but 10 years on such maintenance I don't think this chinese generator has fared any worse and 3 of these would have outlasted one honda or one yamaha generator under same usage by a very long margin.
But again small generators are much simpler than cars, it's a motorcycle engine paired to a generator and AVR.
Just like our industry can make some export worthy products but when there's more technology involved the order goes to china or some other country. Similarly chinese industry also has limits on what they can produce and what they are willing to produce.
I still won't suggest a Chinese Car over Japanese or Korean unless the vehicle is priced same as it is in its home market, china has made significant progress in automobile industry? Yes,
they provide more shashka features?yes but throwing in features is cheaper than developing refinement and quality control.
A 30k Chinese infotainment doesn't compete with a 10 years old used pioneer / kenwood single din unit that can be bought for 3-7k, in sound quality though it has a lot shashkas, yo I'm streaming youtube on a big screen in a moving car with distorted speakers 
I'd say in terms of quality chinese are close to where koreans were 2 decades ago.