I'm thinking of buying one and wondered if anyone has had any problems? I've run a 304 before on a freshwater cichlid tank didn't know if the new models are better or worse.
I don't like them for 1 thing, there is no real handle on it, holding the locking piece can 1. accidently open it ans spill water everywhere, and 2. on larger models it really hurts your fingers due to the weight of water inside. Performance wise its pretty good though.