I have used it - but only to plant roses in ground where roses had grown previously to try to prevent rose sickness. Seems to have worked, though this year will be the real test.
I'm not at all sure there's anything much to be gained by using the product in pots - it's expensive to buy, and when used, must be in direct contact with the roots of the plant, and is really designed for use with plants in open ground. If you decide to try it, I'd be interested in the results, though I'd guess you'd have to treat some pots with it and not others to see if there's a difference.