can you co witness your sights with the Vortex or Burris FF
Yes. I know you can with the Burris. I imagine it is the same with the Vortex.
Let me first say, I am a huge fan of Vortex products and own quite a few, but on this one I went with the Burris. I originally had the Vortex on my FNX45 and the dim setting was just too bright for me. I understand these red dots are for speed, but I do like to slow it down and shoot "precision" which the brightness really hindered. The FFIII low setting is perfect. The FFIII also seems smaller and sleeker on the slide, in my opinion.