If you have a large or even small purse, you need a purse organizer to keep everything where you can find it.  Since I started using one, I have almost eliminated digging around looking for something in the bottom of my purse.  Plus, it's fantastic for a quick change to another purse when needed, or simply sticking in a backpack for a day-trip or travel.  Now I don't need to find a purse that's full of compartments, which used to dictate my purse buying choices.

I haven't had any issues with the zipper (but I don't zip it) or snaps.  Some complained about the bag not standing up by itself inside a (soft?) purse.  I just added a couple pieces of thick card stock to the bottom and side pockets which seems to have solved that problem.