I have 2 sets of DC gauges in the truck.
my 1200 is about 3 years old and has had no problems with the unit itself. I have broken a couple of sensor wires, but have since learned how to care better for them and that doesn't happen anymore.
The 900 is about 2 years old (one of the beta models) and I beat the crap out of it. Still, no issues to speak of.