I love my 10x SWFA but I do t have it on a 308. I consider the 308s I have to be more of a dmr/hunting rifle as opposed to long range rifle.
Your mileage may vary.
I also have a SWFA 3-15 and love it for the price. My 6.5 CM has a leupold VXR tactical with the mil reticle and find the glass bright and easy to see targets in lower light at 300 yards. It has the fire dot in the center of the reticle and it's nice in the woods but turn it off at the range.