I've been using this for just over a month and am really impressed. Over-plucking in the 90s meant my brows have always been pretty sparse. I barely pluck them these days and have had a constant patch on both brows that has never grown brow hair for years.
Using this, I'm already seeing growth (and plenty of it) in this area. Plus the rest of my brows look fuller - as confirmed by my facialist at my last appointment. I'm really looking forward to having properly full brows soon... that may even warrant a little plucking again!
All in all, I really recommend this.