The only failure to speak of is corroaded connection points and wires that stopped the controller from working the winch, after reconnecting the controller direct to the power/solenode, we had it working and this got me out of trouble.
I have an X9 Superwinch, it's aprox 8 to 10yrs old maybe more, mine only has a 2.5HP motor, I bought it second hand in 05.
Baz.