Never used it. But when you look at the Advanced Nutrients site, Revive does sound pretty cool...
super-chelated iron, zinc, calcium, nitrogen
Not that I know what any of that means....LOL...
Haven't really heard of folks using it, but that doesn't mean people aren't. I mean, I suppose it's easier to just do the grow and the nutes right at the start and PREVENT problems as opposed to reviving plants once they've started to go.
Prevent the problems first, and use the emergency measures only as a last resort.
I've had a lot of luck with flushing when things seem overdone or the plants seem stressed...and I really check the pH a lot in the beginning to make sure things are all dialed in...
that and I'm liking my AN line up right now, so that's helping me avoid the crap of fixing things up in the middle of a grow...