I have not had any failures (2004). My opinion is that they are very nice units, and those who think they are junk do not understand how they work and are wired. I thought it was the stupidest devise in the world until I actually figured out how it is intended to work.
Two years and 120hrs and working fine. It is a used unit purchased on VAF so I don’t know how old it is. If it should fail, I’ll keep the switches and front plate and run wires through a fuse block.