Most of Denkalls line is top of the line quality bro. The only problems I have had, were with the high-dose testosterones. The T400 is still causing limps to this day, even though it has been out for years now, and people have been complaining about injection-pain for just as long. Given the high amont of test-powder needed to be dissolved to make that concentration though, it isn't really possible to make it pain free. The "aqua-Test" is only 100 mgs though and hurts like a bitch. There really is no excuse for that. So in my experiences, the only product of theirs that I can say really sucked ass, is the Aqua-Test. The rest are all great products.