I think it also has to do with the style you buy. In May I took Croc Niles, Croc Beach, Teva Pretty Rugged Leather sandals, and Teva Mush flip flops to WDW. Even though my Niles were very comfortable to walk my dog around here everyday, at WDW they rubbed blisters. My Beach ones were much more comfortable (though not as comfortable as my Tevas

). In Sept I was going to take just my Tevas, but my D-I-L convinced my to include three pair of
Crocs (two Niles and one Beach, along with her one pair of Beach), so we could switch them out. Again the Beach were more comfortable than the Niles, but not as comfortable as my Tevas.
I seem to be determined to find a pair I can wear to WDW however, because I just bought two pair of the Aspens and have been wearing them everyday, getting ready for my Dec trip. The Aspens seems to run much smaller than the other Crocs, by the way. So far they are very comfortable and due to no holes in them you can wear them with socks. I love them so far, but remembering my experience with blisters and the Niles in May, I'm taking along my dependable Tevas also. I love my Crocs around here, but just can't seem to find a pair that feels good at WDW.