I have the 60 size Pulse and LOVE it!!! Matter a fact I like it so much when my local hobby shop gets a 40 size Pulse in I plan on buying it. I have a Saito 100 in my 60 Pulse and it is way to much power, just the way I like it. I can't decide if I want to put a Saito 82 or a O.S. 55AX in the Pulse 40, I have heard a lot of good stuff about the 55AX and would like to try one.