I have an SK-50 engine and have not been pleased with it at all. It broke in well, and the first dozen flights went well, then it started to die when pulling up in loops. It has defied my attempts and our club engine collector/guru's attempts to tune it. About 30% of the flights it achieves konk out for deadsticks, and 20% of taxis result in no flight as it dies on revving up. Too rich on the ground, too lean in the air. I retired it in disgust after one season, but remember this is just my experience with one engine.

I much prefer my TT Pro-46 to it.

Love the S/K-50 airplane, though. That's what I had it in. Now that airframe has a ST G-51 and that's been better still.