To be honest I am slightly sceptical that the differential in the Mirages is really 4mm. They don't feel substantially flatter than my DS trainers. That might just be a function of the way they are built though. They are by no means minimal, they have plenty of sole still. They do peeved have quite a firm feeling heel and they are on the more flexible side so they do still encourage a mid-foot strike.
I also find the fit a little odd. They are slightly on the narrow and pointed side for my foot shape and they feel very odd when standing but curiously they feel much more comfortable when running. For all that they are lightweight, grippy and feel pretty good to run in.