I picked up the following in late January:
I got good pricing on them.
The 50" has excessive buzzing. It's in my bedroom and I watch it at night. The buzzing is distracting. I had it serviced once already. They put some felt strips around the edges saying that this will reduce the vibratrions that cause the buzz. I think it made it louder. I registered all 3 TVs on the Samsung website. However, when I went to use their web-based service request form, the site told me that my serial numbers were not valid. They are. And so, instead, I have to talk to a human. During THEIR hours.
The 58" has two problems. The first was a problem with the USB port. It didnt' work. A tech came out and replaced the motherboard. The USB port works now. (I love looking at photos of the kids in slide show format on the screen). HOWEVER, I watched the NCAAs and the players "stutter" or "skip" or something jittery when they move. It's not really fast movement. The result is that the games are unwatchable on that screen. I watched the same games on my 50" and my 63" and do not have the same problem. I'm wondering if something happened when they replaced the motherboard as I did not notice this issue prior. Does anyone know whether there's a setting or something that I may be missing?
I have had no problems with the 63". Note, however, that the 63" is not the thin screen that the 860s are.
The sound on the sets themselves is awful. the 58 & 63 are run through Denon amps into a Home Theatre system. I don't use the internal speakers.
The 50" relies on a Sammy soundbar that I hung below the set. The set is on an articulating arm so it was the best solution to keep the sound emanating from the direction of the TV.
On the positive....
Other than the jitter issue, the picture quality is outstanding. It's really something to look at. Even when off, they look nice. And picture quality is really important.
Samsung's customer service has been below the level that I expected for the price.