No one uses them for repairs.
If there was one thing I'd change about them, it would be decreasing FP cost to 50 and adding remaining(up to current) with .50 cal upgrade, so utilizing their unique rifle nade is actually a reasonable choice instead of punishing waste.
Sometimes I get another one because I'm going Rifle Company and want a sweeper along with my flamethrower
For real though their repair speed per model is tied for the best with all the repairing squads and a vet 3 they get another model which'll make it even faster so I could potentially see a problem if they far more regularly and easily vet up. I mean, their current speed is certainly not unjustified when they're weak as hell (unlike RoyEs like for srs).
I like that too. The rifle grenade option is too infrequently useful considering the sunk cost of the FP is going to make you to go hard on it and 50. cal it, so then the FP needs to be in a good place for the REs to rifle grenade enemies and also lock down the area later with the 50. cal...