I have a Hunter stock on my American Ranch(Gen 1 rotary mag) in .223. It's a big improvement over the Ruger stock, much more solid. I initially had issues with feeding from MDT AICS mags, the bolt would not pick up rounds from the mag reliably. I somewhat solved this by modifying the MDT mag so it seated slightly deeper, but it still wasn't 100% reliable. I waited until the MagPul .223 AICS mags came out, and they solved all my issues. I also found the .25 cheek riser too tall for my ring and scope setup, but solved this with a .00 cheek riser from a MagPul SGA shotgun stock.
I will say it is heavier than the original stock but I think it's worth it.