From a general flying point of view, here in the UK we're never really that
far from an airfield.
The "limited" range still means you can get away from a Farmer's field to a
true airfield where the reception is likely to be better & chance of
breaking the glider much reduced.
As a Discus Turbo owner I'm very aware of the failure rate (mostly pilot
induced) of the current turbos.
I can't believe any electric sustainer could be less reliable

FES certainly appeals to me

Regards

KN