Made like 300 flask so far, but yeah, even that is a small sample. Even if I am low on some herbs when I proc prosperity I just buy some herbs and make before the timer runs out. It can of course transform to prosperity at the wrong time, it happens, but mostly I am free to get something out of it.
Sure, I think it's awesome, some others might not, even the disguise is pretty cool imo. Only letdown is the healing pot! But hey, 2 out of 3 is cool