Why you say that? I have 6 korallias, all controlled by my AC3. Yea they chatter a little sometimes, but otherwise have worked superbly for over 2 years now. When I broke the egg crate on one (my fault) and lost the dry side magnet, korallia sent them free and didn't even charge shipping.
I can't speak highly enough of Korallia. IMO they are rugged and get the job done at a great price.