Just my $0.02, most of the "horror stories" I read about dosing pumps are either user error (creating the wrong schedule or dosing logic) or something that appears to be a software bug, but can't be confirmed as such. I've been using a Jebao doser for well over a year now with no issues, and I know I'm not the only one. Dosing pumps are relatively simple. It's a circuit that turns a pump on and off on a schedule. It's not impossible for one to spontaneously go wrong and dose a whole bunch of solution to your tank, but solid state circuits don't go bad very often. A much more likely outcome is that the pump would malfunction and stop dosing at all, not nuke your tank by emptying your reservoir.
Any time you set up a dosing pump, it's a good idea to test the program with some RO/DI water and visibly watch it dose the right amount a few times. Check on it a few times a year to make sure it's operating as expected still. As long as the pump behaves as expected and you don't spill a ton of saltwater on it, you should be good with whatever you buy.