I have used the xl with the Rick Maas Mod great little thing

also used electronize tbh hated them, so hard to get the run straight blah blah and quite pricey

sabertooth yeh they are great but will cut if you flick to go full throttle from rest but ok

@ Joey nearly got it its an RS80D but they seem to have been discontinued and i got it for speed 900s over kill for drills and possibly for fw

with most electric speed controllers (ESCs) they burn out and die if you put the polarity the rong way round , try not to do this as ESCs are expensive. I wouldn't by duel ESCs because If you burn out 1 side you destroy the whole thing, so I would get 2 seperate ESCs.
I don't agree here if you plan well enough this shouldn't happen and they can be repaired

Dual controllers have bee widely used and if used properly then your ok and imo you get better results

go with a sabertooth 25a id say

alex