I've looked through three of them for more than 2 minutes... a 6x a second generation (I'm pretty sure) 4-14x56 and the hugemongous 6.5-20x56. Let me tell you... that scope is almost unvelievably big. It looks funny on a rifle. I mean, I'm sure it's super-duper tactical and gets the job done for many folks, but it is a really big scope!
All three had decent optics... good enough that they didn't detract at all from the shooting experience but not any better than a current VariX II or Weaver Grand Slam, certainly not into the league of the M1 10x which I assume is very similar, optically, to the M3.
I don't know what the street prices are for the Springfield Scopes are, but looks like SWFA sells them for $560 - $620. I really can't imagine spending my money on the Springfields. I know of two failures out of maybe 8 or 10 scopes that I know the owners or
previous owners of. Not a good record. If I were wanting to go all out on a tactical scope, it would be the M1 10x and I literally would not even consider anything else.
If you want a scope that would make a great, extremely bright and clear variable with 10x on the upper end, high end Eurpoean glass but no funky reticles or target turrets, I'd direct your attention to this thread:
http://thehighroad.org/showthread.php?s=&threadid=23175