I’ve got (I think) six of the FF3s and an original. No failures yet on stuff up to and including .357 revolvers. OTOH a supposedly bullet-proof Sparc II bit the dust after about ten round on one of those .357s. I suspect the small light ones mounted low are subject to fewer stresses. The FF3 also shuts off after a time, which helps old guys from running out of juice.
Another option is one of the 50,000 hour Aimpoints. Leave it on and the battery on your birthday and you’ll never be without juice.
