I ordered this in my usual size, 8.5.  They fit very well.  I have wide feet in front, but narrow heels, and finding shoes that fit isn't easy.  I've finally discovered Keen!

THe only time I order a half size up is if a medium size is too narrow.  THe larger size seems to help.  But in sandals, that usually means they're way too long.  And in Keens, it doesn't seem to be necessary.  My hiking boots are also 8.5s.

These are funky but cute and comfortable.  I've worn them now for a couple of days, and they improve with age.

Update:  I've had these now since last summer.  I still love them.  They still look good with slacks or skirts.  Except for my hiking boots, they are the only shoes I wear in the summer. I've never experienced any discomfort with them.  I hope Keen brings them back next year!