Anyone tried Quickpro (by Roundup) yet. If so, any comments? It's supposed to be rainfast in 1 hr and you only use 1.5 oz per gallon. I just bought some. It costs $110.00 for 6.8 lbs. and makes about 72 finished gals. Havn't had a chance to use it yet because I still have some of the "old" roundup to use up.