I just changed my LN52B750 this week and I must say that it is simply a beautiful demonstration of high definition experience. For the price, the LCD is a great value IMO - and not just because I bought it, I shopped for about 1.5 months and was unable to provide a better LCD screen, this set of features.
One year LN52A750 friend, and I can honestly say that the differences and updates Model "B" - like the high contrast ratio, refresh rate of 240Hz, and improve functionality USB 2.0 Media.
If you are) for a decent price LCD (thin lines with the TV for you!

Best:
The picture quality is amazing, they need to know to see in person to appreciate.
Featured Media 2.0 (USB) is improved and very useful for viewing image files and movies and music.
Foot-Rotary is comfortable.
Coal-TOC is much more subtle red color on other models.
Shipping and delivery was made by Amazon.

Less:
The sound quality (which frankly is not that bad, you have a beautiful sound or a sound bar atmosphere and the issue is debatable)