I did a review on this board a couple years back, had a bunch of photos, but with the Photobucket B.S. I'm sure they don't exist currently...
Anyhow we had a few shooters compare that SWFA 3-15 HD against a Primary Arms 4-14x Mil/mil FFP. Short version is that if you are actually going to be shooting long distances, the PA Flat embare-assed the SWFA in image quality and color accuracy. Even at the SWFA sale price, it is just under $200 more than the PA. Worth looking into.