Having had a car run away from me, because I forgot to put the airel up on tx, I would recommend a fail safe to anyone who is going to use any rc kit near other people. I am running 1 on mu rush, only cost about £10 and does the trick great! Any loss of signal or interferance and it applies full brake, it's saved my car a few times!

Just waiting for my spektrum to arrive now for the MT2, which has built in fail safes.