Dunno - that is one of my points in threads like this...we don't know what the 'problem' rate is. From the reading I do, it is far less of a problem than people like to make it, but that is my reading of the sites I visit. It is like shipping companies or cellular providers - people hate the one that gave them problems and love the one that didn't, but all of them are about the same if you pay attention long enough. UPS SUX! FEDEX SUX! DHL SUX!
I know the potentials for some problems with the APEX, so I take measures to head off those problems. IMO that makes more sense than trying to use aspects of the system that people report issues with. I have been doing the same with all aquarium equipment since the 1980's.
Since we have no actual data (I am not even willing to go through this thread and count), I suppose it comes down to people you know that give you info on the equipment you are interested in. I didn't trust controllers for a long long long time, and it was talking to people that I trust, that have tanks I want to emulate, that got me to start using them more. Forums are great for general information, but it is so easy for information that is not solid to appear solid, that I try to talk to people I actually know and take their reefkeeping seriously about products or methods that I am interested in so I can get the reality on the ground.
Side note - the people going in whole hog on the MSM at this point seem odd to me. The product is barely available and there is no real way to confirm the numbers...so it makes it hard for me to trust it (along with my personal experience). There is just no info yet to say much one way or the other - I hope that changes soon, because I like the idea and the form factor.