I' been flying for a long time [9 or 10 years] and never bought a servo other than jr 537's. I've had .60 size extras and .60 stingers,and so on. I just bought a little toni with a saito 100 on it and 5 DS811's. The plane flies great . It came with a JR 421 witch is an entry level computer radio and does not have dual rates. I bought it as a ceiling deal at our ONLY local hobby shop and was told it had been flown. It needed a fuel tank , battery and switch. Any way, the specs for the plane are 54oz so the 811's match well,but 2 flights bring a fully charged 1450 millie amp nickell metal down to 80% charge. The aileron servo's do chatter alittle bit but I don't like the power they use.