there seems quite a lot of possible problems
1) Geometry
2) Screen Purity problems (blobs of different colours in various bits of the screen on light/white backgrounds)
3) "Dirty Screen" Effect when the camera does a slow pan over a light background, it looks like the screen is dirty.
4) Green trails when there is a scene involving a fast moving light source in a dark background.
5) The default setup for colour / brightness / contrast looks horrible.
Moo had problems with 2) on two seperate screens, and there seems a general problem if people return them, the new one has the same problem - I wonder if there are problem "batches".
I've looked for all these, and the only problems I have is 3) and 5) - although 5) is easily sorted.
I've not seens anybody complaining about 1) and 4) for a while, so I don't know if these have been improved.
There is a similar set of problems on the Panasonic PD30, with people trying out loads of sets until they get one they are happy with.
There is a new Panasonic TX36PL32, and as you say the new Tosh, the ZP 48 - whether they are any improved - I dunno.
If you look at any brand, Sony, Phillips, JVC, even Loewe, there are reports on here of Quality Control problems.
I think 36 inch is pushing the limit on CRTs, there seems to be less complaints with 32 inch, (probably partly because any defects are less visible on a smaller screen, and partly because it seems it is difficult to manufacture a 36 inch tube consistently)
Having said all that I am really pleased with my 36zp38 - and I've just watched all the LOTR again and I think the picture is stunning, and it is very good (& quite forgiving) on Sky, even the low bitrate channels. One of my friends who has a 42 inch Tosh RPTV came round to have a look and he was amazed - I've pointed him at these forums and lent him by DVE disk - so he'll be tweaking his picture now !