The wasp is the cheapest of the .26 engines out and it's pretty good. Plenty of torque for your money. I have the Picco version and it's a beast just not as easy to tune as I'd like. As far as comparing to a RB S7 or anything else high end. IMO the .26 engines are close to the high end engines on the bottom but will not pull the top end like a S7 2 or many other high end engines. If your on a budget get the picco. If you have money to spend get the RB you will be happy you did.