I've used RO with great success on extract batches with adjuncts. However, I too am very concerned with my jump to all-grain. I've asked on the forum before and nobody seems to know exactly how to compensate for the lack of minerals. How much gypsum do i add to 6.5 gal? how much 5.2 do i add? (if any) these are the questions that i would want to know. If you could pin-point how much of these minerals and additives to add to the water to create certain profiles then it would be foolproof to make perfect water. However, I think that this might cost more because you would be buying the water in addition to probably adding more salts/nutrients to the water as opposed to most brewers who already have some amount of this in their water. Discuss.
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