Very comfortable; easy on, easy off.  I wear a size 8.5 regular width shoe and find the adjustable strap gives enough room for play to use an 8M croc.  After wearing for a period of time the crocs do tend to loosen up a bit.

I like to keep two pairs active; one for work (w/socks) and one for overall daily use (wo/socks) including yard work, going to the beach, fishing, and even climbing trees to pick avocado.

Although I don't have the thickest soles the bumps are not very discernible and definitely not a detraction.

I have never water-proofed the uppers; preferring the natural effects of everyday wear and tear that gives each shoe character.

New crocs are rather slippery on both the inside and outside so be careful.

I have worn both the Mexico and China constructed crocs and have no preference.

Based on my walking pattern the heels get the most wear.  I have not worn a shoe through yet though and change my daily pair about every 12 months as they can get quite beat up.