The Samsung 940BF is pretty much an extension of the 930BF which is pretty popular. Plenty of info on this one in the sticky which should help inc loads of user comments. Essentially the same panel, with a slightly turned up overdrive (MagicSpeed) application. The 940BF uses a Samsung TN Film panel though, not sure why you asked about a-Si as well?!...imagine it's mentioned somewhere for it? FYI though, a-Si is "Amorphous Silicon", don't need to worry about this really.