Good question. I don't see offset irons used, well, ever. Scopes and reticles are getting better all the time, it seems that offsets are dying off quickly.
Personally I have yet to see offsets with a Razor. The eye box and lack of fisheye at 1x is the best reason the RazorHD excels for 3g.
The razor is faster and more precise than irons in the active environment that's typical of multi gun.