I don't have one of the Primary Arms ACCS, but mentioned it in regards to a specific need request on the EVO boards and someone who owns posted that the BDC reticle only is really useful when pairing with a magnifier...
In brief, you have 3 primary types of optic options depending on your needs.
No magnification optics which are divided into standard red dots and then more expensive prism type optics like the vortex spitfire 1x. The main difference is that red dots are projection of light onto a lens while the prism are etched reticles and also have the illumination of that reticle by projected light...
Fixed mag optics (AFAIK all prisms) like standard Trijicons, some of the primary arms offerings, and the Vortex Spitfire 3 or 3.5x (don't recall exact offhand), among others.
And then variables such as the Bushnell 1-4x second focal plane AR optics, 1-4x first focal place Bushnell PCL optics, and then Vortex 1-6 second focal plane, and a few Primary Arms second focal plane offerings as well below $500. Bigger budget offers more options...
Biases -- I don't prefer Vortex Red Dots since most have an "auto-off" feature... The spitfire is not a red dot and does not have an auto-off.... And I prefer a first focal plane for variables...
If you have your rifle setup as an all purpose, it's extremely difficult not to recommend a variable scope. 1x works like red dots and magnifications work like fixed mags; but there's a little more weight with variables...
Perhaps significantly, the 1x prism optics like vortex spitfire do allow for adjusted focus of reticle to your eye. Standard red dots -- your only adjustment for less than perfect vision is to turn down the intensity of the red dot to project less light which makes it appear smaller and more refined...