The Aimpoint H1 and T1 are only 3 ounces and approx. 2.4 inches long.
The T1 model is night vision compatible.
The Comp 4 is 4 times as heavy at 12 ounces.
That's a huge deal to folks who have to "hump" and are equipment savy as every ounce counts and can affect somewhat the balance and physical space of your weapon.
Trijicon has models which accomplish different roles with different power sources as you know.
I use Troy di-optic Diamond shaped peep (as in not round), tritium front M4 style battlefield sights and a Bushnell Elite 1.25-4x24 4200 model Illuminated Dot in the crosshairs.
