Yes, I have been using it, works great for alignment. Haven’t used RevoicePro 3’s VariAudio/Melodyne tuning function yet, one advantage over VariAudio is it can be used for other instruments and ranges besides voice … though of course it would be helpful only if the algorithm is good … look forward to trying that out one day, but TBH, I’ve just stayed with VariAudio so far.
The doubling function I’ve had some problems with … there are about half a dozen or so programmable parameters, but I found that any significant variation from default results in weird tuning artifacts … as though there is only a very tiny sweet spot on the “dial”. Staying within the sweet spot works well, but at least in my hands it makes it hard to dial up a 2nd double that is significantly different than the first, which is sometimes what I want to do.