I love my Chameleon Insert! Actually, I have one of each size, but pretty much only use the small one at this point. At first, I liked medium the best, but the small one fits everything I need, leaves a little room to spare in most of my bags so I can tuck other things along the sides and is low enough that I can see/find things quickly. The walls on the medium and large are just too high for my comfort.
I also have two Joey Jrs (the regular and the drop in). These are almost exactly like the Purseket. They're ok, but I don't like the way the regular one tips over in some of my bags and the drop in really doesn't fit that much. I also don't like how the regular one kind of pushes out the sides of my bags.
P.S. cgsprings...I ordered an AC mini tote too! Should get in on Thursday. It'll be the pearl color. But I want the tan one too if it ever comes back in stock anywhere. Guess I'll just be hopeless with you.