Jagers are good. Visi-therms used to be okay but now they are crap.
Either way, I would always have it plugged into a secondary controller as a backup, something like a reefkeeper, apex, or ranco. Its pretty unlikely for two separate thermostats to break. I also replace my heaters every few years even if they are in working order just as preventative maintenance. Heaters are cheap and you can always find someone local willing to buy a used heater locally for a few bucks to help cover part of the cost of a new one.