Hello; One flellow at our field has a 4 star 120, he had a new Saito 120 in it recently, but it started making a noise, so He put a Saito 150 in it while the 120 is away getting fixed. He had a super tiger 90 in it before that, but we were never able to get that engine working just right, and he was never happy with that engine. He was happy with the 120 before it started making that noise, but now that the 150 is in there, I don't think he would go back. We fly at sea level, and the four star will hover with the 150.