Got a Vortex FFP (Viper HST) 6-24x - works really well.
BUT, biggest benefit is shown when you combine the Mil reticle with a Mil turret.
Spot fall of shot and adjust using hold off. Want to dial? Just read off the reticle and put in appropriate clicks.
Hole appears where you want - second shot.
Zeroing? Two rounds to arrive at correct mpi - then a further couple to confirm group. It really is a simple and quick system.
Pretty impressed......... & I seem to be starting to think in centimetres!
Rgds
Ian