What's the difference? I have a vortex sparc and like it but I need a second sight for another AR. I do have a slight astigmatism and the dot on my sparc is kind of starry but it doesn't bother me much. Reason I'm curious about the difference though is I have a chance yo get an eotech 512 for around $230ish or a exps2.0 for just under or right around $300ish. Or maybe it's just the xps2.0...not sure but either way I'm just wondering if the eotech are worth it or do most think they are over rated? Are they that much different than the vortex sparc? I know the dot has the ghost ring thing around it but what else is different. Exuse my ignorance on the subject, I'm kind of new to the world of red dots and such. Also palmeto has the sparc with 10pmags included so that's pretty sweet.