I have owned and used most of the Aimpoint red dots for a number of years now and like most here, am partial to the T2 on the AR platform. I purchased a Sig Sauer Romeo 5 for use on an inexpensive PCC (Ruger PC9) a while back and was impressed with it especially given the cost differential. My question is can anyone tell me how two seemingly similar products can have such a wide cost differential.

The reason for my question is that my son just purchased a S&W M&P Sport 2 and i as a good dad provided the Vickers sling, Colt side swivel and extra Magpul mags. He wants an Aimpoint because i have one but is it really that much better than a $140.00 Romeo 5?