Thanks for the info so far, I guess to narrow the question; Are there any brands you should steer clear of? I've been running a O.S. .40 FP in my Midwest AeroStar for some time now. I want to buy a Sig Four Star (60) or Venture 60 next so I will be looking .61 size.

Another Question: Is the O.S. .46 AX ABL that much better than the .40 LA to warrant another $50? If my buddy had the money, should he upgrade to this motor for his Trainer?

Has anybody any beef with the Tower Hobbies engines?