I'm really torn on this subject. Remember what happened to Andrew Jesky at Red Flag; ran out of fuel waiting to land, got it down and off the side of the runway but with no fuel those Leonardo's will drop the tail down to the ground. His engine attempted a restart; started a fire in the weeds and burned the thing to a piece of junk.
I've also seen quite a number of guys attempting a deadstick, get it on the runway and the autostart initiates and usually results in a hot start which burns the model. This seems to be most common in models with twin engines which is probably the place I'd have thought it would be most valuable. Now I'm not sure if I want to use it or not.....