Input lag.
I got the KDL55W900A. Sony's newer tvs are the best you're going to get if you're a gamer who wants a large hdtv because the input lag is ridiculously low for such a large size in comparison to the alternative. 19ms on game mode. However when not on game mode, the input lag is noticeable. It's like playing on my other hdtv while on game mode.
I made three set ups for my tv. One with the best picture I could on game mode, one with the best picture I could with everything off, and one with the best picture I could with clear which seems the smoothest setting on the tv without making everything really dark. Game mode degrades the image quality very slightly and gaming on clear looks amazing, but it looks amazing while introducing noticeable input lag to me.
