More than 4years old, still loving our LN750A52, great picture and sound. Viewing/Sitting is at almost 20' and comfortable.
The Samsung replaced a 40", Westie and the 750 has been a great choice and we have no issues and no regrets.
In all it's glory, 750 is mounted on multi-directional Kanto mount, concern for, fireplace heat has not been an issue
If ever to replace, a 70" would be considered...but in meantime, all is good.