I can't speak to the classic or featherweight but I really enjoy my supergrade. It is currently installed on my 26" barreled .264WM and it is great. I do plan to build a .338WM in the near future and it will be built using another supergrade.
My only other M70 Mickey is a Compact Hunter's Edge...totally different rig (20" barrel) and purpose but I love it just as much.
