Just posting this for anyone doing research on this model (as I think this thread is pretty much dead).
I bought this recently, started researching it, and became very concerned that the pentile display would ruin it. I even went back to the store to examine it. I was prepared to cancel my order and go with the ST60. I decided not to though. At the store I thought maybe I could notice it at what I thought would be normal viewing distance. However in a display wall it's impossible to get a feel for the real display. Nothing immediately jumped out at me so I shrugged and let the order stay.
It arrived late last week, I've now watched TV content on it, xbox games, and blu rays. This TV is magnificent. We came from a 720p mid-tier LG, so maybe I don't know what good plasma actually is, but this is just amazing to my eyes. So sharp and incredibly crisp. The colours are so rich, and there is no pentile grid effect. I'll repeat for emphasis; there is zero noticeable grid effect. We sit about 8-10' away, and every colour in the spectrum is as solid as ever.
However, I do notice that solid white colours aren't quite as bright as I would prefer. However I'm not sure if this is a pentile problem or just the way it is. Now, solid white still looks clean and bright enough, just not quite as bright as I think would be perfectly ideal.
Aside from that, I am loving this television, and am glad I went with it. No regrets on my part whatsoever. And you cannot beat the price. We paid about $1100 CAD.
And now I learn that had I gone for the ST60, input lag would've been greater for playing xbox. So that's a bonus with staying with the F5500.
Anyways, just my two cents.