I have been playing with this XO1 with my Grand Son it's running on 6s ,,,2200kv CC motor ,, we run with the Strong Island Face Book guys using GPS & laser beam speed traps we have a 800 FT run up today we had 2 passes of 124 back to back & the best of 125,, I bring one of his RC friends down with us he filmed this https://www.youtube.com/watch?v=W7-fiDw-qcg PS the leaves were tripping the traps today,,thats what i'm looking at ???? so we used the GPS