Many times i have been asked are they comfy? Yes, they have never blistered me once however i have heard others complain so always get the right size for you!
I generally wear a small UK Size 6 or a 5. I wear a size 5 for my creeps but i could do with a size 4, as i find them quite clompy!
Wearing creepers is seriously just a fun experience, people will stare at them with admiration or antipathy ;).
Finally you can look & buy all these babies from here