I have a M-10 AIR-121 that I put into my APEX (07) and cant believe It took me this long to make the move. After all the money spent on(stock) shock revalving from one spectrum to the other and broken suspension parts and knowing its the only thing that is really wrong with the sled the M-10 is worth every penny to me,IMO. After a little talk with FAST and reading and understanding the adjustments on the M-10 it has been a very good move! Some guys will think trying a differnt OEM skid is the way to go cause its less money are not considering what doing that really entails. Or that ya just need some shock upgrade or revalve to the stock skid have never ridden a properly set-up M-10.I have heard some guys talk about the M-10's down side but I cant find any....and Iam picky. Besides i see it this way ,I have no reason to buy a new sled for some time now.....so the M-10 just saved me a whole lot of money!.....I love the new ride. Highly recommend one.