Pentile is a terminology issue. Technically it's got fewer overall pixels (R,G,B combos) but it's still able to make the same number of distinguishable lines on the screen and to your eye, evaluating pictures and text, etc. it looks the same as well. You may be more likely to see a "screen door effect" up close than a non-pentile display but generally speaking if you can see it at all you're too close to the TV anyways. Simply put - in real life you won't know there was anything lacking, because results-wise there isn't.
Trust me and the other owners, when you get it home, plugged in, calibrated (look around here for that) and pop in a movie you -won't- be disappointed. Technical semantics aside you got a great TV at a great price. You won't find a better display for what you spent.