I've bought some of their stuff. I have a set of sbc heads that I bought that had stainless intake valves. One of the valves broke at the o-ring grove. Fortunately it was at idle. I suspect they were pro comp. I replaced the one valve with a nos Manley, I was paranoid for 6 months, but all is ok. It may not have been a Chinese valve, and it may have just been a defect, it does happen in even the best parts. I'm pretty sure I'd shy away from their rollers in a race motor. A streeter that just gets goosed occasionally I might take a chance. I'd look em over real good though before you install them. Now days I don't trust any parts no mater the brand name. You never know, they are changing source to off shore everyday.