Never used that exact engine but SH is the company that made the first engine that LRP cloned and made the .28 spec 3 that is so popular and has been cloned many times by other companys like the Losi 454 so if I had to guess Id say they probably make pretty decent engines for Chinese mills. Someone may come along and correct me though as I have no first hand experience with SH engines.
Never ran one but back in the day they where some good sellers especially for the price. Lots of people ran them on some of the other forums I look at.