RE: 3Gx performance
hi, i have a 450 pro v2 with a 3gx, and about same flying level as you. the first firmware versions had some small issues, but i have upgraded mine to ver 2,1 and are about to go to ver 3.0. it flew just fine for me, a little confusing to set up based on the bad english instructions (and me being a norwegian doesnt help either... so go for it, and use the money on other things, imho.
bjørn a.