I still like PTG and the Purseket. They both work better in different bags. The Purseket (Large?) works awesome in my Speedy 30. The Jumbo PTG is *small* for my Galliera GM, but I like it because it keeps the slouch going. I also bought a Large PTG which I am using in some other bags.
The center of the PTG is small. It looks like you can increase the space by flipping it inside out. You don't have to put things in the center though. You could just put your large items, like a wallet, outside of the PTG and let the PTG sort of close in on itself.
I like the Jumbo size better because the pockets are deeper than the Large size. I find the pockets pretty shallow on the Large size.
All in all, I am not some die-hard purse organizer fan, but I like them because they make switching bags much quicker for me. I like to switch bags in the morning before work depending on my outfit and it goes so smoothly when I just have to grab the organizer and put it in my next bag!