I've been a fan of Chaco sandals for years, and own 6 or 7 pairs.  These PedShed's have the same XO1 footbed as the Z, ZX series and Hipthong sandals, which lets me wear my favorite shoe year round.  Of course Chaco is discontinuing this shoe so if you know you love it, better get it now.

As to fit, I saw many conflicting suggestions as to what size to buy.  Some seem to think they run bigger than the sandals and suggest sizing down 1/2 size.  My experience has been that it fits exactly as it should, with or without socks in the exact size you buy in the sandals (that is, if you wear the XO1 footbed, not the XO2-like the Bulloo styles-I find they run a bit bigger.) The shoe should fit your arch perfectly, and there should be space at the end of your toes.  If a shoe is right up against your toes they are too small.  Toes need a little wiggle room to be healthy.

I wear mine with medium thick wool socks, and at first they seemed a tiny bit snug, but by the second wearing they broke in beautifully.  If you have high arches or need arch support, these are for you.  If you have flat feet or are not used to a pronounced arch in your shoes, you might find them uncomfortable, or may need to increase the time you wear them gradually until you get used to them.  I have high arches, and usually wear orthotics, so I love that I don't need them in Chacos.  And the secret to not having them slip off at the heel like a clog is to snug down the strap--works like a charm.

The Shiitake/Whisper are kind of a suede, a great neutral color, and don't seem to show dirt too badly, so far.  Get 'em while you can!