viewsonic vp191b confusion please help.

I was trying to find further information on the Viewsonic Vp191b after reading toms latest viewsonic reviews.

However i have been reading alot of contradictoray information on most websites which leads me to bleive that toms using a new revision of this same model number.

most of my google searches showed this model as having a 20 to 25ms response time , The viewsonic website claims 8ms GTG, and toms shown ~16ms actual..

SO my main question is how can i determine whether or not the Vp191b i plan on purchasing is an old revision or a new one.. What revision is the new one that uses the faster panel?

And why the hell didnt viewsonic change the dam model number as this is quite confusing.