Chinese drywall
"objects as heavy as 700 pounds on a smooth wall"
I don't know about your house, but the vast majority of houses in the United States use Drywall for interior walls...and the majority of this drywall comes from China...and is rather substandard when compared to drywall from the 60s and 70s...as such, I would not trust *ANYTHING* mounted on a wall unless it was anchored into a stud...and 700 pounds on sticky-tape on the average living room wall? Wow, I can't wait for those lawsuits to come!