I certainly prefer my gardening supplies come from the US. These are from CO. Anyone run it?
Wouldn't recommend it man. Their testing is suspect, and the Nutes are expensive as hell. If you're looking for bulk nutes, you're better off working with a commercial ag solution. If you're looking for something simple, I'd suggest the same, but taper down the formula.
A lot of commercial growers out in CO have found that the RX Green Solutions pricing is pretty damn expensive and doesn't have anything actually special to it. You can easily find a Made-In-USA nutrient that isn't as pricey.
In the end, it's a nutrient marketed as "for marijuana" and has all the telltale signs - more expensive than the competition, and not much real science, just conjecture.
Edit: To tailor it more directly toward the question: Their old formula from about a year ago wasn't very good (even they admit it). They've recently updated it, but a lot of larger commercial grows who have tried out their nutrients opted to stick to salts or traditional commercial ag nutrients since they get the same results for far less.