I've dealt with some. Back in the days kind of crappy but to me they were better then nothing, especially when I was on a college student's budget. Had one on a bike for about a year before I sold the bike and it worked just as good as the old school Daytona dampers, I couldn't tell the difference. Recently bought one for a project I'm working on and the dampening and adjustability is way better then the factory 09 ZX6R damper I had on the bike before getting it revalved. A lot of people are concerned that it will lock up on you being a cheap chines company. Not all Chinese product are made equal so I choose to buy from the reputable Chinese companies who's item are usually of better quality. People can continue to protest about it's your life you're risking, yet I've never had a cheap Chinese damper malfunction on me but I've had my brand name Hyperpro damper malfunction on me.
My view point on the matter is if you're just puttering around town and just want something to keep the front straight just in case you hit a pothole, I don't see the problem of investing in a well known Chinese company product, if you're on a budget. If you're going to use it to race or aggressive canyon carving, I would recommend to invest in something that is race proven and have a reputation for reliability. This is no time to be experimenting with possible subpar products.