I have seen them on eBay and other places. I never considered buying them because they are usually colored and I automatically dismiss any cymbal that is blue or red
Painted cymbals can't sound good, at least not yet.
Anyway, I looked them up on youtube, and I think the chinas sound alright, but I have a really different taste in chinas. I usually go for cheap cymbals when it comes to chinas, I dunno why, but I like them better most of the time. Besides the chinas, I don't like the sounds, either. They are sort of dense and trashy but focused (?) or something like that. Either way, I wouldn't buy a Krest cymbal. I'm not familiar with them past what I have mentioned, I have never seen/played them in a store or anything, but because of that and their lack of market here, I have see no reason to give them a try when I could buy a Sabian
and not worry about whether it will sound good.