I went to hhgregg today and checked out the 850B 55" they had on display. I'm looking at buying a 65" inch but I don't think it will matter much since they both have the passive display. After seeing the stunning 3D presented on the 900A, the first thing I wanted to do was see the 3D. The rep put in the 3D aquarium disc and I was really impressed. I walked from side to side watching the 3D image and there was minimal ghosting. Standing up higher and sitting/crouching down presented some ghosting however. The sweet spot range is good if you're going to be completely level with the TV so note that when you decide where to place the set(or buy new furniture lol). I would say the 3D could pass for 4-6 people watching at eye-level with the set. The rep brought me a gravity disc and to my dismay, it wasn't the 3D version like he had thought. This was ok though because I got to test out the black levels and the simulated 3D of the set. First the bad: the simulated 3D is unbearable. The image is ghostly as hell. This is in deep contrast with 900A where I got to see a normal DVD be upconverted and simulated where there was minimal ghosting and truly outstanding performance. The good part of this gravity test was I got to see the stunning black levels of the display. I was really hesitant about getting the 850 model because of its edge lit dimming, but let me tell you, the blacks blew me away. Inky blacks and no discolored corners from the edge-lit display(I'm not sure what that's called where the blacks end up looking greyish). I told the rep that when I buy my 65in, if it doesn't look like -that- I will keep returning it until I get one with this kind of quality. The movie looked phenomenal. I do prefer the B models because they are brighter and it really brings the picture to life(for me). The picture was uniform, no visible banding that I could tell. I don't know if this is something because I was so close to the TV or not, but in the non 4K content I watched, I saw little grains all over the picture. I'm sure that when I'm at normal viewing range, you wouldn't be able to see them but I figured I'd mention them nonetheless. Overall, I left feeling better knowing I am going to be getting the 850B in September when our house is done. Personally I think this set is worthy of the XBR brand and not a KDL like someone else mentioned.