I kinda missed this question back in August, maybe because I am so enamored of my sling bags (which may have been what I needed all along when I started this).
The Gregory is working out great. With the addition of the sling bag, I don't need it nearly as often, but I carried it around at the Newport Folk Fest and related flights (which include a stopover "on the way home" in Chicago for a couple of days) and I was happy to have the slightly larger overall space AND the lighter overall weight. Particularly since I wound up with a leg issue that made walking... uncorfortable.