I do freelance PR/Shooting Event's for Nikon and I can assure you the turrets do not turn on a whim and as for the reticle sucking, Myself and others have blown up four inch jars of tanerite at 600 yards using Nikon's BDC reticle and Spot On Ballistic Program. Incredibly easy to use and also very accurate for longrange shooting. Just enter your shooting data and off you go. I have personally purchased 2 M-223 3-12 BDC 600 and Rapid Action Turret Scopes for my own AR's. I use them at shooting event's and coyote hunting.
Drop me a note if you have any question's. I don't do any sales but I'm sure there are site sponsors that can help you out.
http://i1216.photobucket.com/albums/dd363/bman940/M-223%203-12/M-2233-12RAT.jpghttp://i1216.photobucket.com/albums/dd363/bman940/M-223%203-12/1-1.jpg Ahh, so the company who pays you makes a flawless product..
BDC reticles suck. Period. Nikons may be one of the worst. As for the turrets, the MOST common complaint regarding the P and M series scopes is the ease with which the turrets turn.
The Mark AR is a much better scope than either of the Nikon offerings. Reticle choice with matching turrets, VX2 glass, turrets that actually stay put, with mil and useless BDC markings, available custom turrets, including ones that feature ONLY mils, available illumination, and its a Leupold. There really isnt any real comparison.