I bought this to try as a cheap alternative to the ludicrously overpriced photographer's vests on the market. I only received it today so have not used it in the field yet, but it looks quite rugged. Amazingly, it can accomodate my DSLR body (without a lens attached), 18-50mm lens, 70-300mm lens, 10-24mm lens, cable release, filters, spare battery, tiny 6" long tripod, and the massive rear pocket swallows my 10" tablet with ease. It will actually take my 15" laptop, but this spoils the comfort somewhat. With all that kit onboard there are still some small pockets empty!
I ordered the XL size after referring to the sizing chart and it's a perfect fit. It was despatched promptly and is as described. I understand (and somewhat share) peoples' frustration regarding the limited access to the larger pockets (because the zips don't go all the way around) but I can fit my DSLR body in 1 and my 70-300mm lens in the other so for me at least it's not a huge issue.