In the past I used UBEC's exclusively in my 10 cell e-helis, and every one failed in time, but always at startup, So I just learned to put connectors on them and carry a spare. Then one fine day, I had one fail in a 3 foot hover, the machine just rolled over and died. I have never gone back to a UBEC or anything in between my RX power and RX. I use 4 cell NiMH packs only.\

Just my $.02

Chris