What are your views and recommendations on Video Eyewear Glasses?

Hi Guys,

I have seen a few offering different size displays including 44" 50" and 80" Obviously the larger screen would be ideal, but the image appear more blurred. So, I am interested in buying one but I would like to know how clear the screen appears through the glasses. So, please recommend a specific make or model for the video eye-wear glasses.

Thanks
Simon Joseph