Thank you to every last one of you. This has been immensely helpful. Every single post just made me want a Stone Glacier even more. I was mostly worried about belt quality/comfort, and Luke saying that his review was with the one piece and much support for the 3 piece has alleviated my worried about comfort. Really, thanks to everyone for making my decision easier. Especially jmez for writing such a thorough review. It really resonated with me.
I wish I could try out every pack on the planet. But I can't. Buying a SG with their 30 day warranty seems like my best route. At this price point, I want the best pack I can get for me. Kifaru very well may be a great pack, but too many over the top Kifaru fan boys on Archerytalk, Elknut, etc have just left a bad taste in my mouth. I know that's unfair to the company, but it's the truth. If Kifaru was the stand-alone winner, I'd get one. But SG being neck-and-neck, I'm excited to give them the first shot.
Now, I just have to decide which one! 5100 or 6200... oh decisions, decisions...