These are the best pull-ups for pre-potty training as well as potty training!  I actually got these originally as leftovers from a coworker and didn't like them because I didn't realize you rip them at the sides to take off poopy diapers.  Once I was set straight, there has been no going back!

Around 18 months we had a problem with our daughter taking off her diaper because the tabs of regular diapers were too accessible; when we switched to the Easy Ups she finally left her diaper on.  As she got a little older, having the Easy Ups helped her learn how to pull her diaper (and underwear) up and down.  Now she is a little over 2 and almost completely potty trained.

They are also very soft!  Our babysitter's daughter has extra sensitive skin and all the diapers they tried would irritate their daughter's skin around her hips...except these ones.