We purchased it because Rely was unavailable. Bayer has left many customers without Rely. Not a good thing. Pro: could be purchased through mail order. Same active ingredient as Rely. It does work Con: more diluted than Rely so more expensive for the same results.
This product works very well to kill weeds, but does not have the lasting effect of Roundup. You will have to apply about twice as often as Roundup. We have made the decision that it is worth the cost and effort to avoid using the potentially harmful glyphosate found in Roundup.