Would be a 5 star but no instructions. Although ultimately the installation is easy there are things which can be done incorrectly and which could consequently be expensive. I mainly used GSD321 excellent video on YouTube. However his video is for Tec levers. Unlike the Tec levers GLS ones don't need to carry over any parts from the Triumph originals.
Once fitted they work very well and seem to be very well made.
GLS levers have the Triumph logo etched in which others don't.