I just got a pair of two days ago. I think they are great! I have only had the chance to climb with them indoors on an artificial ice wall with step-in crampons.
-Everyone I know that owns the boot finds it hard to slide their foot into the boot, but once your foot is in the boot they are comfortable.
-They are very rigid.
-I normally wear a 10 - 10.5 sized boot, but I purchased an 11 so that I can wear extra thick socks and still have some dead air space.