Ive just bought a 46W5500
On turning it on there was absolutely no clouding what so ever
After about 8 hours there is a very slight blotch top right, but only just perceptable when its completely black
As for the colours, I have to disagree
Perhaps out of the box without proper calibration the older W series looks better. But the 5500 calibrates almost perfectly, its colours are close to perfection.
Marantz AV8003. Arcam P1000 Power Amp. Monitor Audio Silver speakers (Old style). Arcam CD32 cd player. Pioneer 42" Plasma. Pioneer LX50 dvd player. PS3. 16 core braided mains cables. Isotek Sigmas + Mira. RA Mains Block.