Are these that good and worth it? I have a spitfire 3x sitting around but doesn't get as much use beacuse it's on the blurry side up close: https://www.amazon.com/Vortex-Optics-SPR-1303-Spitfire-EBR-556B/dp/B00HYRGNLM/ref=sr_1_fkmr1_1?ie=UTF8&qid=1472921466&sr=8-1-fkmr1&keywords=vortex+prism+4x

Is it worth selling that and picking this up?

Based on everything you said here, this covers most of it. An easy reticle for ranging and calculating drop. low enough power for close shooting and you can still mount a RMR on top. I had one on my SBR and just got rid of it for a no magnification because the eye relief isn't enough on my SBR.

I will be getting one for my AR10.

http://www.amazon.com/Vortex-Optics-SPR-1303-Spitfire-EBR-556B/dp/B00HYRGNLM