I have (had) a Stream 50 powered by an OS 52FS. I bought it at the Toledo show for $130. It's a great plane, construction and covering second to none, excellent hardware including the retracts, but it won't fly competetively with the said engine. The OS 52 will not pull the plane vertically and loops are definitely small. The engine was brand new. I hadn't used a gallon of fuel when I unfortunatelly crashed the plane (didn't hear the engine quitting - that damn 3D gasser...) and it landed in the woods resulting in a broken wing. The Stream was a smooth flyer while it lasted. I've had several small sized pattern-like planes (Hobbico Spectrum, GP Venus, Saphir 40, etc.) but no one flies as good as the Stream.
I have a perfectly fine fuselage, cowl, belly pan, and tail for anybody who wants to pick it up (free!).