I think the title says it all.  They're so comfortable I practically live in them.  I have a herniated disc and damage to both knees.... and these are about the only shoes I've ever had that make both happy.  I'll be buying more fit flops.

As for the other reviews... yes, they run a bit big, if you can go into a store that carries them and try them on, it's a good idea.  Once you know your size in them, you should be able to order online no problem.