I've only had a chance to use it once so far but it was definitely invaluable! The ability to just walk up, refill, and go on your way without any hassles makes this product worth EVERY penny! Before, I'd have to take off my tac vest, pull out my tank and then refill. No longer, my friends!
I would definitely recommend this product to ANYONE that wears their tank on their back. You'll absolutely love it!