To be honest I myself don't know about seat height adjuster i thought 4-way means slide forward + slide backward + back resting part forward + backward.
I'm very satisfied with my V2. Just 180 kms on ODO so can't give a full review at this moment. I haven't really dragged it much. I feel the pick is just great. Slight push to the pedal and it just goessss. Will give review about its performance in a few days