Thanks for the welcome!
Wether someone chooses to buy a used big name or a Linhai is more personal comfort zone and taste. You can, as pointed out, buy a used Japanese unit for around the same price as a new Linhai (lets say $5,000 here in northern BC). My Honda friend sticks with Japanese because that is what he knows - he spends lots of time fixing and working on them, but loves it and that is what he is comfortable with.
For me, getting started, I am happy with the Linhais because they are well built and reliable and affordable. I don't have time invested in any brand previous to this. The only "problem" Ive had with them are the batteries - and that was my main feedback is they need to all ship with SLA or gel batteries out of the box. My units, one came with a gel (no problems) and the other came with the LA battery that wasn't so good.
I think it has been pointed out that at one time Japanese units were "crap," Polaris was "low end," and Hyundai and Kia were "junk." I see the Chinese growth following a similar curve. There will be only a few out of the 100s of factories making ATVs that last and do well long term.
I like that Linhai has kept it simple and made gradual improvements rather than rushing out the next mass market poorly constructed machine. They aren't "knock offs" or clones - they look similar to Polaris, but have their own engines, frames, etc. I talked to one of the guys who toured their main factory and apparently they have 9 R&D departments and their own big dirt testing track out back, so they are for real. He also showed me pix of the knock-off factories, with no R&D and no testing. So it seems Linhai is for real, in it for the long run.
I wish they'd put more effort into their dealers and marketing in the USA, it probably hurts them to do direct sales and have individuals do their own PDI and maintenance. Low prices though.