I am owner of Panasonic P50ST50D for over seven months now, and clocked over 1500 hours. I am happy to report that I faced no major problems till now. Apart from the issues mentioned in the poll, a few more issues have been reported such as colour banding, dirty screen effect (DSE), motion judder, etc. There was a one incident on my TV about IR. It happened when I switched off the STB and forgot to switch off the TV. The words "STB" were displayed on the TV for considerable period of time - nearly 2.5 to 3 hours. After I came back, I was dismayed to see the words faintly etched on the screen. I ran the TV vertical anti-IR scroll bars for two nights and whenever possible switched the TV to "TV Input" mode instead of standby. I am happy to report that the traces of IR vanished after the first night itself - I kept the second night for making sure. There are some who fared much worse, did not follow safe-care methods and some were downright unlucky to get bad TVs.
I have only positive things to say about ST50. Actually, I do not say bad things about any TV (FMs, please do correct me if I am wrong). I feel that it is not up to me to be a critic. I can only report what I saw and felt. If there was something bad about my TV (or any other AV equipment), I will say that it is my piece that is behaving like this and that. It is for others to judge whether that is a generic issue, good or bad.
The only negative thing I would say about plasma TVs in general is the amount of heat generated. Now it is not like that the room will feel like you are sitting next to a furnace - but it does become warm. I purchased my TV in July when Summer was over in my city. Summer is now approaching and maybe in May, I will really know about the "thermonuclear" effect.
For a complete review, please read the following posts in the thread
ST50 Owners' Thread - First impressions, Reviews, Tweaks, etc.:
[post=389531]50ST50D - First impressions[/post]
[post=391598]Updates after one week[/post]
[post=391772]ST50 Remote[/post]
[post=393809]Streaming HD mkv files to ST50 via DLNA[/post]
[post=394275]ST50 Power Consumption and Heat Issue[/post]
[post=398159]The 2012 Panasonic 3D glasses[/post]
[post=446244]Plasma TV and the high power consumption argument[/post]