I'm running an Aimpoint T1 on a 45 degree offset next to a TA11 ACOG. The big place I find it really useful is where I need to shoot from my offside - that can be difficult to do with the ACOG due to the combo of magnification, non-dominant eye and cheekweld. If I didn't have that requirement, I probably wouldn't se it at all.
I'll warn you that you can get a good face full of gas from the ejection port that way - especially when you use a suppressor.
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