Anecdotally what you hear means very little. It's inherent in the limited cross section of discussions you can read or participate in. Your survey is going to be ignored by a large number of users because it's a topic that's been rehashed so many times so that limits the anecdotes significiantly.Anecdotally I’ve heard that growers in particular have started to use them more commonly
Why don't you instead contact all the coral growers that advertise on R2R and see what they say ?