I've had this bag for a month now, I ride everyday and so does my bag. So far, it's performed beautifully. It's been rained on several times and not a drop of water inside. The straps are comfortable when I wear it as a backpack, and mamy people have asked me where I got it. The sissybar loops are perfect! It holds very well, it doesn't shift around and I'm never worried it's going to fall off. My one concern was the buckles, they seem a little flimsy but so far they're holding up.
Space wise, I wish it was a little larger but only so I could carry more stuff. I always carry my raingear and a couple of tiedown straps and there's room for clothes for a couple(4) of days and my toiletry bag. I have ZERO complaints and would 100% recommend this bag to anyone looking for a great bike bag.