Pro:
The toe box on these are great, and they have the 'look' of a flat shoe, which I like.  I like the toe shield.  My last pair of Merrells didn't have one, and you get a hole at the big toe.

Con:
They have a rigid plastic 'shell' that molds your feet snug in the middle.  Not a big deal.  The biggest problem for me is that I can feel a little bit of a heel and arch support.  Technically, these have a zero heel drop, but there is a little padding in the heel and that is what I'm feeling.  It is sewn integrally on the shoe such that it can't be removed.  I would overlook that, but the arch support IS noticeable, and it is not just padding.

Stack height (heel/toe): 11.5/11.5mm; footbed: 0mm; insole: 3mm; midsole: 4/4mm; sole: 1.5 web, 3mm lugs