I've had the Panasonic TX-P42G30 for one week. This tv was purchased to replace a 28" CRT with built-in freeview tuner. The picture quality of the Panasonic is outstanding. In shops, like Comet and Currys, it's difficult to see how the picture from this set is as good as the punchier images from the LCD tvs. The panasonic looks bland by comparison. However, if you examine the LCD screens carefully you can see that the white parts of the image regularly 'burn out' losing detail in the process. When you get the Panasonic home, you realise that it retains lots of detail in the whites and blacks giving a picture with a much wider latitude (somethings photographers constantly strive for) giving a much better range of tones with a realistic look. Freeview HD is handled extremely well with superb colours and smooth gradients.
Sound is better than expected for a flatscreen tv but external speakers would improve it greatly.
Internet connection via the tv is a little limited (no Google for instance) but you can received BBC iPlayer HD, You Tube and Facebook etc.
One excellent improvement is the ability to search for a particular programme in the programme guide so if you miss a programme it's easy to locate a repeat in the coming week. One other good feature is the ability to record to a USB hard drive. I bought a 2 TB HDD which can store a lot of HD films, however, be warned that the tv has to be switched on during the recording (no good for recording when out for the night or when you're on holiday!). The tv also features a SD card slot so I can watch home movies from my HD camcorder with ease.
On the downside I would say that this tv has 2 issues, one temporary, one permanent. Initially, there were sound problems on freeview HD. After 10 mins or so of viewing, the sound would suddenly double in volume and the quiet parts of programmes would become very noisy. This issue has been resolved by Panasonic by issuing a downloadable software update (which will also be broadcast on 17 May).
The second issue is buzzing. During contrasty scenes, a fairly loud buzzing noise is created which is pretty irritating. If this didn't exist the tv would be perfect but the buzzing is just a little too loud (hence 4 stars). You can't really hear it if the sound is turned up but sometimes loud audio is not always desirable. In its defence, LCD projectors also make a noise (even my old CRT tv whistled), as do PCs and laptops.