Hmmm - I wouldn't use one. Call me a brand snob, but cassettes need to be Shimano. Sunrace never set up quite as well, and I've seen a few that just don't work properly out of the box, due to poorly made teeth.
Currently running a Sunrace 8 speeder and so far so good. Shifting midway up hills and handling dirty conditions pretty well. By comparison ran a Sram cassette and it broke a tooth after only afew months and jumping gears because of it.
I have used 8-speed sunrace cassettes with no noticeable problems. Also use Sram and Shimano. Shimano XTR 8 speeds are rare and too expensive to be grinding away with a chain.