Last week i bought the MTS (55"-59") for one of the TVs i purchased.
Unfortunately the stand does not support the tv weight (Q55) and keep on tilting down / forward even though i already tightened the screw.
However, i manage to stop the handle from tilting down by inserting the screw in between to stop it.
My overall experience purchasing with PRISM+ is awesome from the support until the delivery guy. The products are easy to install and configure too.