Swiss Products website:
http://www.swissproductsllc.com/
Length of pull comfort can depend on many factors besides shooter's height.
Shooting position, angle of shoulders to stock and where you place your cheek.
Butt plate adapter just fills curves on stock's butt to give you a flat surface to add a regular recoil pad.
http://www.miracerros.com/guns/gn_rp.htm
Diopter sights really help shooters whose eyes are past their prime.
There is a learning curve unless you already shot a lot of rimfire or centerfire match rifles.