The new omna's are the same identical formula as sustanon 250; I've used (in the past) omna (old formula) , nile's , kerachi's and the original (and THE BEST) Russian Cyctahoh 250's. Personally, I've had bad-mediocre results with Nile's.. got sick once, I consider nile's an inferior product.. kerachi's are top grade (since the indian made russian cyctahoh's are impossible to get these days and mostly counterfeited) strength wise, the old omna was a workhorse.. definetly stronger then sust (in terms of sides as well) more water, more bloat, etc. But now.. it's basically the same formula, either way now I won't touch anything but kerachi (never had any problems with them and flu was mild at most)