I do absolutely enjoy the product. I have never regularly used a hydration bottle during my runs. I have either gotten dehydrated, run "out and backs" to come back to a hydration source or chosen a course that has water along the route. Certainly not an ideal solution.
Recently, my triathlon running sister advised that she has found your hydration shoulder holster to be the best she has tried. And... she has tried them all...
I ordered the single holster model. I have used it twice and found it to be comfortable enough as long as I run with my hands high and in good form. If I drop my hands too low, the shoulder straps bind at the front of my shoulder joint. It is not bad... a run of 10+ miles did not leave a mark. However, it is something that I keep adjusting the pack to try and lessen as I run. I have also adjusted the straps a couple times hoping to find the magic spot.
I definitely will take it with me when I am running longer than 5 miles in unknown territory. For at home use, I have ready hydration points along my route. So, I do not wear it. Yes, I recommend the product.