The tuning feature is helpful, but that is also available on the Lift X.... Soooo is the ARC worth it? Depends on how much you value the tuning feature and how different you feel the ARC is from the Lift X since its on both bows. A used LIFT X is still cheaper than the new ARC. The cam is a little differently oriented on the ARC which supposedly makes the back end of the draw a little different and a little faster....but is that worth $1500??? I don't think the ARC has a lot different compared to the Lift X, but that's just me. So if you felt the Lift X wasn't much different than the Lift, (and you passed on the Lift x) then the ARC isn't going to be much different for you.
I expect every brand (not just mathews) is going to claim their bow is the best made by said brand. It's marketing suicide to say "this new bow is just as good as last years and you should keep what you have."
I was looking real hard at the new Xpedition Nexlite 30. A magnesium riser bow, 3.2lbs, and only $1499ish. That's when I was considering going for a new bow...
FWIW I ended up buying a used Lift x 29.5 because the deal was too good. It came with everything (mathews 1 piece lowpro, limb legs, epsilon v2 rest, SAS, SCS, and 2 sets of strings) but no sight (which I had) for $250 less than a new ARC or Xpedition bow. I don't regret it at all. This was my second bow and is a pure hunting bow for me. My other bow is a more target bow and its not a mathews....