I had been waiting for this product for some time and ordered as soon as available. I wanted the benefit of a bottle for quick fill and multiple drink choices and the belts bounced/were not comfortable.
Have done a few hours of running with it thus far and it feels strangely natural while wearing. Really no complaints as of yet. Will be giving it a good 3-4 hour run this weekend to see how it goes.
Construction quality seems good and the overall design is well thought out. Overall very happy so far.
Update: Got to head out on a longer run this weekend and after 4.5 hours and 6K of climbing still happy with the pack. The pockets provide plenty of storage for gels, electrolytes or anything else you may need. The pack feels very natural and does not bounce even on a long downhill. Having bottles again is great as they give you the ability to easily see how much you have taken in. All-in-all still happy with the pack.