I have two 25 year old Guest units that still work with excellent charging profiles.
Knock on wood.
But I consistently hear of issues with the newer models.
It appears they are all a crapshoot to some degree these days other than Dual Pro, a hugely popular bass boat model which is also repairable, but as such, it is questionable for saltwater use since it is not completely sealed.
I'm sure there are several good ones out there, but Noco is an affordable sealed unit that appears to be more reliable than most, including Minn Kota, and that is what I would go with.