I use have the 1515 2.5D in my truggy and usually use it on 5s, but have also used it a bit on 6s and geared it for low to mid 50's (haven't actually tested top speed though), in summer and I haven't noticed any problems with deans.
I have never used anything except deans and have never had a problem. I personally think that most setups would benfit more from shortening the wires to the minumim length that is required rather than replacing the deans with bullet connectors.
I can't decide if its more fun
to make it...
or break it...