V2's have a higher step-up ratio and are quiet. I moved from a V1 to V2 because I hated pulling next to anyone and them always wanting to race, or just look over with a WTF look on their face.
Very happy with the change.
the picture above...
looks like they either had a very heavily oiled (and dirty) filter or a high speed seal leak causing that black oily-dirt around the impeller. otherwise, the impeller looks decent.