Personal experience lang that may vary from person to person:
Last 2007, I purchased a Samsung LCD from Abenson, and in just a couple of days, I saw around 3 very bright stuck/dead pixels on the screen. Long and short, Abenson asked me to call Samsung which I promptly did. It took around 3-4 days for Samsung to send a technician over to check my unit, and after evaluation, they decided to pull out my LCD bec the stuck pixels were very bright and were quite large.
After 3 weeks, yes 3 weeks! I got my Sammy back but I noticed it acquired some panel scratches already, the worst part is, it still had stuck pixels though they were not as large as the previous ones. However, I felt like I ended up buying an item that was no longer minty fresh and even "aged" before I got to use it thoroughly.
Fast forward to 2008, I heard that there was a good dealer in Shang, called Sights and Sounds and I purchased a Panasonic LX80 LCD from them. After awhile (1 month) it had 4 dead pixels as well, but they sent a replacement the day after I made my complain.
Bottomline:
I prefer SnS simply because of the way they treat customers, I have nothing against huge chain stores but for me, what's important is how a dealer responds to a complain during the warranty period of an item.