I have the ds505blhv in my maxx 4s, it's the only promodeler I've bought. I had it powered off a MMX, but it couldn't handle it very well with a 4092/1650kv motor, or my MMX is just being weird... I put a castle 10A bec in it and it was better. It seemed to do ok when I had the 1515/2200kv...