I use the Boss FV500L for playing Lap Steel and Pedal Steel guitar (after a buffered pedal of course).
It is built like a tank (like most Boss products) and I am confident it will last a very long time.
The only issue I have with it is the volume sweep.
It seems like all the action happens in the first 20% near the heel.
There is a small dead spot in the heel down position to about 5%, then a quick jump in volume up to approx 10% (not smooth in the first little bit), followed by a steep sweep to nearly full volume all in the first 20-40% of the sweep.
From 40% to toe down, there is almost no change.
It feels much like a logarithmic curve.
I would prefer linear or exponential...
Because it is built so well, I will keep it and modify it.