I am looking to buy a good powerful motor for a .40 size 3d plane and the 55AX is looking mighty tempting. What are your opinions on these motors? Do they tune easy and hold a tune? Is there any other .40 sized motors that are as powerful? I was looking at the TTR pro .46 but like the idea of the extra power of the 55AX. I just don't want a motor that is a pain to tune.