I have a brand new sts .28 in my kyosho inferno buggy and I am still running it in. It is fantastic value for money (mine only cost $112USD) and absolutely hauls. I've heard they out perform the SH .28 too. I did have a problem with mine initially - I couldn't get it to hold a steady idle. It turned out to be a faulty front bearing, but the STS stockist here was very helpful and replaced the crankcase and bearings free of charge under warranty - luck of the draw I guess. Otherwise, no complaints!