Love. These. Shoes.
I have worn Crocs as work shoes for more than 10 years and I LOVE these. I'm a nurse, and work 12 hour shifts, and my feet and legs NEVER hurt after a shift. Many of my co-workers have those crazy expensive shoes that are supposed to be designed for nurses and I hear all about their sore feet and how they have to switch shoes mid-shift because they are still "breaking in" their new work shoes - I love knowing that I spent more than $100 less for my shoes and can comfortably wear them for the whole shift from day one!
Benefits of this particular shoe? The non-skid sole is a must - regular Crocs are way too slippy-slidey on wet floors, and the side holes are a great improvement over the non-vent Bistros. My feet still feel sweaty, but not nearly as bad as with my last pair of non-vented. These still meet our dress code, since they don't have top holes and have a strap (so they aren't technically "clogs" per our code). It's also very handy to be able to dump these in sink and submerge them in bleach without ruining them if I get something nasty on them at work!
Just FYI - I have a co-worker who ordered the same shoes, and says that they hurt the tops of her feet. I haven't had that issue, but she has a higher arch than me.