I was trying to hold off giving my review of Opti until I had more time, as GH is slow seeing changes, but I'll chime in with my current impression. I've used pharma GH in the past (Saizen), and a variety of different chinese/generics over the years. Never in crazy bodybuilding doses, but lower doses for injury repair and health. I've been using Optis for the last couple months, and worked my way up to 3iu a day. If I go any higher, I get the carpal tunnel symptoms. I wouldn't say that Optis are "strong", but that they're properly dosed. To me they are about equivalent of pharma GH. The problem is that most generics GH is dosed incredibly low and then marketed as higher than it is. So that places Optis head and shoulders above the competition.
In my opinion Optis are accurately dosed (which is a rarity among generics). If their quality remains at the current level, I will be very happy. Also, their customer service is the best of anyone I've dealt with. It's quite refreshing.