I have the Burris 332 and I like it. The eye relief is short and that made me mount the optic quite far back on the rfile. I still need to move it back a bit. I also find it a bit low but that's just me. I don't have any operational experience with an AR so I don't know what it should be like. I haven't tried the Vortex. Vortex warranty is legendary though. It's worth considering. When I bought my 332, Burris was offering a rebate. It took forever but I was pleased when I got a nice cheque in the mail. $100.00 IIRC.