I personally have an XBR2 and could not be happier.
I finally talked my dad into replacing the first gen DLP as it was taking several minutes to power on. We looked at the Sony and Samsung LCD's. We decided ont he Sony because the screen had more of a matte finish and he has some glare issues in his living room.
So it came down to the 52" XBR6 and the 52W4100 which is one step below. For the difference in price of $1200, we could not find a reason to go with the XBR over the W. He has been extremely pleased with the 4100, so the extra $ would not have been worth it. The 4100 has been replaced by the 5100.
That reminds me, the a630 Samsung has a matte screen with the 650 being "glossy." I only see slight glare if my light is on and the screen is black.