Pure Blend Pro does not have the OMRI stamp on the bottle anyway... It does say that it is organic though, and some of the other ingredients are certainly part of a good organic regimen; for example, it already contains some kelp, humic acid, and sugar ingredients.
But yeah, I personally use and love it.
I use the flower formula in coco along with TopMax, molasses, and CalMag Plus.
I also hit the plants a few times with some Neptunes Harvest Kelp Extract for good measure.
My plants smell delicious!

Of course I am about to switch to the mid-grade botanicare line, Power Plant/Power Flower because I got a killer deal on 5 gallons of the stuff for only 90 bucks, when the usual price would be 200 for the 2 parts...