I use revive on everything, but had my first fatality about 3 weeks ago. I noticed my ORA Blue Tip Turquoise Stag was being bitten by something, not sure exactly what it was, but the bite marks were on every branch. Had this guy for a while, grew from a 2" frag sick to a 6"x6" mini colony and never saw these marks until recently. I also have a rainbow monti that had lost all color, and was pale purple with no PE at all for about 2 months.
I had just gotten 5 millie frags that day, and made a large batch of revive. I dipped the 5 millies together for 15 minutes, then dipped the rainbow monti and stag together for 15 minutes.
The stag was 100% RTN within a few hours of being returned into the tank. It didn't even look "that bad" before I dipped it. Great color, PE, just missing very very tiny patches of tissue in random spots on each branch. After about 2-3 hours, it had NO color, and was completely bare skeleton. I was shocked. I assume it was actually worse than it looked, and couldn't take the stress of the dip.
All my other corals were in the same batch of Revive, and are doing fine today. And a few days after the rainbow monti was dipped, its base color returned, and I am consistently getting full polyp extension with neon yellow and an orange ring forming around the outer parts, so the dip definitely helped heal this guy.
I would continue to use this product, and recommend it to others, but would warn that if a coral appears stressed it would be a good idea to use a lower dosage, or to dip for a shorter period of time.