Gotta say they're cute.  And at 14$ they were a smart buy.

SIZING:  Pretty true.  I have the five.  They are a little roomie in the toe, but I can't honestly say they are really bigger than the typical five.  They seem neither wide nor narrow.  So, width is pretty true, I think.  (Judging by other reviews, sizing may vary from pair to pair, perhaps?  This pair seems pretty true to size.)

ARCH?  Slight.  Mini little arch support (which is more than some brands provide in this "style" shoe.

Comfort:  So far, so good.  (These are new shoes, so, you know, I'll have to wear for a whole day to decide, and our weather here has been entirely too wet for velvet shoes!)  They have good cushioning and a good grippy, non-slippy tread.  I often have issues with the back of the heal being uncomfortable (frequently too high), but these seem to be "ok" in that area.

Material/Look:  These are very, very velvety.  Almost like a house-slipper.  Which makes them cute, but not weather worthy or as suitable for as many outfits or seasons as a canvas material would be.

I do recommend these.  :)  No regrets.