i tried a set of the prototypes on at NvS last year, overall i was impressed
the cheek pads instead of traditional nose and cheek piece was very comfortable, in fact they are if anything a little more so than my I4s, the lenses seemed huge so a huge field of vision, out of the tints that were availible i would go for a darker one (smoke or possibly mirror) as they weren't as dark as most and they look much cooler
however i can see a couple of problems arising through early stages of release but i'm sure these will be addressed quickly or even before release, the first and most important is with the lenses, the prototypes did not have thermal lenses (i am unsure if they will when released) and unless they have a very powerfull anti fog coating or device then i can see fogging beig a very common issue, esspecially as i was breathing directly onto the lense through my nose due to the cheek pads
another problem which was suggested by a team mate was that the fins on the front although looking great,you would have a hell of a job to get paint out from behind them if they aren't removable in some way
all in all they are very comfertable, look the tits and have great vision, however the lenses might let them down in the long run (being right in front of the wearer's nose) but only time will tell
from the people that tried them at NvS LIPS got loads of pre orders so everyone seemed impressed
hope this helps
Ryan, team domination