I have two .46FX and a .46LA. They all run great. But as stated they are differant engines. The LA is OK if you understand the limitations and just want some mild flying around. They really are reliable and smooth. If this is your first or only engine and you are going to perhaps put it in something a little faster eventually you might consider the TT .46 or even the magnum there very good also and about the same $ as the LA. I dont think you could go wrong with any of these.