Thanks for the fast answer TFTFanII
I've used the Acer AL922 with MVA panel and now I have a Eizo L767...
In my opinion the MVA is slightly faster than Samsung equivalent PVA.
And this can explain the review result.
ViewSonic usually take panels from Chi Mei:
But, as you say, I don't think it is fast enough for games like first-person 3d shooter.
AUO (Acer) say they will solve the MVA slowness using new driving electronic.