Things work and things don't work.
Why would a LHS say a fail safe doesn't work? [sm=48_48.gif]Oh yea its all about the parts they sell from run away cars that find walls and tree's and stuff. You better take a pole m8 because there are far more people out there that swear by the operation of a fail safe and if you have a good Radio set up it is built in. You got a bad unit or hooked it up wrong. I have hundreds of them out there and a few have had problems but most people thank me for installing them on there cars and trucks. [:-]
Well considering since the fail safe was for my MT2 which is all aluminum and titanium, I don't think my hobby shop is worried about making any money off of that truck because I have yet to spend any money at my LHS for that truck. They know where I get my parts for it. Also on another note, the manager at the hobby shop is one of my good friends. I am not sure how sheisty your hobby shop is but my local hobby shop is straight forward and won't tell you to buy something or not buy something to make some extra money. They are the type that will be honest and straight forward with you so you will keep coming back.
The bottom line is, a fail-safe is not needed. You just have to be smart
and know the limitations of your radio and car and keep your car within those limitations. That is why I just recommend installing a battery indicator, that way you know the limitations of your battery. Plain and simple.