In my case it's just a "straw that broke the camels back" moment. I've had a lot of issues with Hydros since setting it up a year ago and hit a lot of limitations. I'm a software engineer by trade, though, so many of the downsides of Apex aren't an issue for me like they might be for some other folks (& I totally understand that).
Hydros has a lot of good ideas that seem to get half-implemented and left half baked forever.
For example, I bought the skimmer level sensor and attached it to my skimate collector and I thought that I would be able to hook this up to my skimmer pump to automatically shut it off -- but I can't. Why? Because my skimmer pump is controlled by a WaveEngine and the two products don't integrate.
Actually, I have probably 10 issues and 8 of them are related to WaveEngine features being non-functional, half-implemented or variations of "this should definitely work but the UI is so restrictive I can't plumb it"... which is coincidentally the last big product release from CoralVue. In my mind, it's a consistent trend of marketing-over-product.