your satio 125 is a damn good engine! I have the 150 and 180.I also bought a dle30 .I think different engines for different flying styles and situations.I dumped ally 2 strokes but I'll never part with my satios.they are so good.I went with a dle30 for my seagullextra 260 instead of my 180.performance is equal if your flying it as a sport rc.but I like mixing in some 3d so the dle30 gives me a bit of an edge.for the best 3d performance the lighter airframes around 9.5 to 10.5 ...