I have found that the pampers swaddlers are a very effective diaper! I have used a few different brands and these diapers are the only ones that I have never had a problem with.
They are taller than most diapers in the front and back so it protects from "blow outs" occuring, and leaking. Even with this extra protection they are not bulky like other diapers. They seem to be a little more comfortable for my daughter to wear. The tabs are very sticky and even if they have to be adjusted they are still secure.
They are a little more expensive than other brands of diapers but I feel they are worth the price! My daughter can move a lot better in these and they do not leave marks on her legs. They are very good at keeping messes inclosed with the mesh type material on the bottom of the diaper. I really like using these and plan on using this brand for a while.
Update On Feb 16, 2008: We still use only these diapers and are now in a size 2. They are still great and we have never had a leak even when we have a "poopie explosion". These are great and I definitely recommend them!