Converted one of my 2.5" HD quads that I didn't fly any more. I am super happy that I did, I feel like I can fly though anything with these bumpers :) I am getting about 3-4 min of cruising with a GNB 2s 520 and 3s 520. 6000kv might be on the high side for my type of flying. I'll try some 1105 5000kv motors in the future.