So far I have used the bagmate for a month and the purseket for a couple of weeks and now the chameleon. The bag mate is great but it is a little small and tends to slide around a bit in a birkin 35. The pursket I have used for a year + in my other bags and it works well . . . but with a bag like the birkin that has sides that are explandable it did not work as well. It pushes out the "batwings too much. The Chameleon x-sturdy takes up the perfect amount of room with no sliding and. I also bought the non x-sturdy and it too would work well as long as you have it filled. The x-strudy holds its form no matter what. I will attach pics.
P.s. the purseket is PERFECT for the LV speedy. It makes it hold the perfect shape
P.S. I know I am OCD and have nothing better to do