Couple of pros and cons in my opinion.
Supposedly an excellent return to zero.
Tool-less installation and removal.
Streamlined foot print. Not much of anything hanging off the edges which is great for the Scar platforms given the reciprocating charging handles.
Several height options.
Quality, all mounts come with a driver bits for install.
The cost. They can be a little spendy but the Leaps for the Aimpoints are probably the most reasonable.
Not a true QD. While they are a tool less design you arenít getting that thing off as quick as something with QD levers. It takes a little time and effort.