We had that type on the Ribcraft for a few years, in quite an exposed position at the back of the boat. Considering the environment they were in, and the fact that they were unclipped at the end of every day's use, they actually lasted quite well. Longer than some of the electrical bits on the other boats — if I remember rightly, we've replaced two isolators on each of them in the same time.
They clamped on to the terminal quite strongly, and I don't recall ever having problems with them, except forgetting to connect them and the battery box being in an awkward place. But they never really felt completely trustworthy.
The battery was moved back under the console for this year, and the quick connectors replaced with nuts. It's a much neater arrangement.
Just have to hope the isolator lasts a bit better on this boat.