In my personal experience, Samsung is no better than anyone else in terms of standing by their product. I purchased at Samsung HDTV that should have had a QAM and ATSC tuner. Well, I had to have it repaired one time and when it was repaired, they replaced the electronics inside with a board that no longer contained the QAM tuner. I called Samsung and tried to reason with them that this TV no longer met the specifications for which I had purchased it for and they offered me $150 if I returned the TV to them.
Now I understand what they mean when they say "specifications may be subject to change." The problem is, I know the TV had a QAM tuner before because when I first got it, when programming channels, it would ask questions referring to the QAM function. When it was repaired, it no longer asked those questions, but my owners manual clearly shows the screens involved with the QAM tuner.
Anyway, don't think for a second that Samsung will stand behind their product any better than other manufacturers.