Some notes after owning the TV for a few weeks now:
1) Audio - During the first week, the audio wasn't particularly good. It sounded artificial. I think it was because the speaker drivers were still stiff. Sounded like the high and low frequencies weren't lined up. So, the sound was both thin and bloated at the same time. Imaging was way off. After a few weeks, the speakers started to sound fine, detailed and full. Nothing to complain about for sound coming out of a flat panel.
2) Picture quality - played with settings quite a bit during the first week. Used Cnet, Black Ops and my own settings. I was not happy with skin color with any of these settings. I finally settled on the THX setting and boosted the panel brightness (not the brightness) a bit. I didn't like the THX settings at first because it defaults to the Warm 2 color temperature which makes the picture look too brown. However, it's the only setting that produces a natural looking skin tone. Skin color using other color temperatures settings just look annoying to me. However, for animation, I much prefer using a cooler color temperature and using S-Curve for gamma.
3) Brightness - This is my first plasma. I had a Sony Z4100 which is a very bright LCD TV and a Sony HX800 which is a smoky dark LED TV. The GT50 is probably brighter than both of these TVs. I would say the brightness is more than plentiful on the GT50, however, I am ambivalent about the quality of the brightness. Sometimes, the TV looks like a big glass box with a big bulb inside sorta like a CRT. Perhaps this is because I am not used to having a glass like panel on the screen as opposed to a less reflective panel on a LCD/LED TV as those on m two Sony's.
4) Buzz - Yes, my tv buzzes a bit. I will give the customer service a call to see whether they can fix it. I rather not return the TV as there's nothing else wrong with it. Buzzing is either faint or undetectable most of the time. The buzz's volume would go up with it displays something bright and/or if you turn the brightness setting up.
5) Upscaling - picture quality using the built in Netflix app is spectacular. When watching Netflix with laptop as source, the picture quality is still very good but just a bit off in compared to the built in app. OTA pq is just good whereas poorer signals are not as well rendered on the GT50 compared to on the Sonys. SD upscaled to HD on OTA makes the video looks old/dated. HD signal (720+) picture quality is just so so.
6) Bluray off PS3 - I only watched one video, Davinci Code (the first one), on the PS3. This is probably the only time I truly see what this TV is capable of. The night scene at the Louvre really showed off how well the TV can render a balanced brightness and detailed picture quality even during very dark scenes. Makes me think that what I complained about the TV looking CRT like is something attributed to lower quality video source hence making the TV really picky about the source. Using the PS3 playing Bluray is the only time I can truly say I like the GT50 better than the Sony HX800.
7) Browser - It's actually not too bad. My initial experience is wasn't good at all as the browser crash each time I get on a web page. However, after a few days, I actually was able to get on my usual pages where I stream video off of. The usability obviously isn't as good as using a PC. Typing in search terms or URL is very frustrating. However, after bookmarking my fave sites, this made usability much more apparent. The browser still crashes from time to time but only probably 10% of the time. There are a few bugs though. Sometimes the video streaming navigation bar randomly disappears. This makes it not possible to maximize the video screen. And, ads on sites are a problem as it's very difficult to get the cursor on those small "x" to close them. Pop up ads can cause the browser to crash too. The built in browser doesn't open pop up ads, but, when they do attempt to pop up, it does cause some instability that leads to the browser to crash.
8) Form factor - I was actually more looking at the ST50. I got the GT50 only because it has a narrower bezel. My alcove can only accommodate a TV with 46.5" width. This TV is the largest that I know of that will fit in the alcove. So, I am very happy about this TV's lack of a bezel heft. The TV does have a bit of a retro look to it because of the thin metal frame around the bezel. Reminds me of an old Panasonic boombox from the 80s but in a good way. I like retro electronics. The inputs are off the the side which makes it harder for wire management, but you can get adapters to change the direction in which you can plug your cables in.
9) Ergonomics - Really getting used to the remote. Initially, I thought the remote is awkwardly geriatric looking. But, it's actually a pretty good remote. The web browsing experience is low but still pretty good for casual web streaming. I still need to hook a laptop to the TV when I get frustrated with the built in browser. I am not certain whether you can use just any PC AC cord to use as the AC cord that came with the TV has a locking mechanism on it. Menu navigation works great. I wish there's more than one custom mode for the video setting. And, I wish I could access the Pro settings for the all the other video modes.
Overall, I always thought plasma is better medium than LCD/LED when watching movies and sports, but LCD/LED gives better PC using experience. And, I never liked how much glare plasma screens give off as well as the overall form factor being bigger/thicker as well. The GT/ST50 models are very thin, so that's a plus. I never had a problem with plasma's lack of brightness as I usually leave the brightness settings to under 40% on my other TVs. I think the GT50 is a bit too bright. I think I prefer a smokier darker screen. And, I'd like to be able to use a non-warm 2 color temperature that still reproduces a satisfying skin tone.