First post here....just thought I'd share my experience, FWIW.
Purchased a LN55C630 a few weeks ago at Best Buy. Had it delivered...panel version was SQ01 with firmware version 2010/02/17_001002.
Once I got it all hooked up and turned it on, I was pretty impressed. My previous TV (now in the basement with the Wii for the kids) was a 55" Mitsubishi Diamond rear-projection...the flagship model from 2004. A very nice (and spendy...at the time) set that I had ISF calibrated. Still a tough picture to beat to this day, IMO. Anyway, I was pretty happy with the new Sammy.....until about 20 minutes after I turned it on.
This thing was an absolute LEMON. I have read through the bulk of this thread and haven't seen anyone describe the same problems that I had. Basically, once the set 'warmed up', the picture would go in and out. It looked as if a giant hand was wiping the picture away, from right to left. It would go out for just a second, and then come back. 10-15 seconds later, it would happen again. The longer the set was on, the worse it would get. Tried several inputs (HDMI, Component, Composite)...all were the same. Also, the resolution on the TV completely deteriorated and basically became unwatchable.
Called BB, asked for a replacement, which they promptly agreed to (no questions asked!). They delivered me a new one two days later and took the old one away. This new one has panel version AA04, and I noticed that the firmware version on this one is much newer (2010/09/15_001005). Anyway, I must say that this new set, after about a week and a half of watching it, is REALLY NICE so far! Even my wife, who was used to watching a high end, professionally calibrated HDTV, noticed how nice the picture looks.
This TV has a ton of adjustment options, which is great. I've gone through and performed some basic adjustments, and when I have time I'll really dive into it. But my first impression with this (second) set is that this is a great LCD for the price.
- my initial impressions on overall picture quality is that this thing ROCKS. So colorful, crisp, and clear. My main video source is a Direct TV HD DVR with and HDMI connection. SD channels, as expected, look crappy....but that is expected. But whoa....HD Theater, Discovery HD, etc.....looks awesome!
- black levels, once a few adjustments were made, look great.
- Haven't connected a blu-ray player yet, but regular old DVD's, connected with component cables, look very nice.
- skin tones looked strange at first, but with a little tweaking, no problems.
- the black screen test: turning the source on a given input OFF to check out a completely black screen looks decent. With a CCFL backlit LCD, especially this big, I would actually EXPECT to see some level of light leakage around the edges and/or at the corners. Testing this out, nothing really jumped out at me. Standing up off the couch and moving over to the side, you can start to see the edges of the TV lighten up a bit, but from my normal viewing position with a totally black screen, I see no issues.
- off-angle viewing seems fine to me. We have seating all across the living room, and it looks good from all positions. From the extreme positions, the picture lightens up a bit, but it's and LCD. Whaddya expect?
- the AMP feature makes things look weird. We were watching a sitcom, and when the people moved...I dunno how to explain it, maybe this is what people refer to as the "soap opera effect". Whatever it is, I didn't like it. Very strange to me, and very noticeable. I changed it to "clear"...that seemed to help. Watched football on Sunday and I could tell a difference when I switched it between "off" and "clear". Perhaps I'll play with the custom AMP settings when I have some time.
- the looks of this TV are great (the bezel, the stand)...very minimal and stylish. Being able to swivel the TV on the stand is an added bonus.
- I have no complaints with the glossy screen. I have a lot of windows in the living room, and during the day, things still look very nice. I suppose if I really concentrated on trying to pick out reflections, I could find some, but it just isn't a big deal to me. I think it looks nice, both on and off.
- the first TV that I received had a blanking insert (for wall mounting) and a little deal to secure the TV to the wall to prevent it from tipping. The second TV I received did not come with these items. I thought that was a bit strange.
- the speakers on this TV suck. They fire downwards. I stuck my head behind the TV to make a connection and they actually sounded better back there. Not a showstopper since I have a receiver and speakers to set up...just haven't got there yet.
So anyway, that's my experience so far. Like I said, I've read through the bulk of this thread, and it really seems like people are getting so hung up on black levels not black enough, I have XXXX panel version and I hear that XXXX panel version is better, viewing off-angle isn't perfect, etc. There was one post several pages back that summed it up nicely for me, where the poster said something like "people expect perfection from something that, technically, cannot achieve perfection". Now quality will certainly vary from one make/model to the next, but sure seems like there are some people out there that will just never be satisfied with any TV that they get (is that called "TVlitis"). What it boils down to is "does it look good TO YOU?".
Don't get so hung up on the little things, and purchase from a reputable retailer that has a good exchange policy in the event you get a bad TV, and you'll be happy.....I hope.