Discraft's fairway drivers are fine discs but the single number stability rating, coupled with the confusing categorization as "Extra Long Range Drivers" doesn't sell them very well.
It's difficult to tell what the hell the difference is between an XL, XS, Cyclone, Stalker, or Tracker is by looking at that number. It's just a difference of 1.0-1.8 so like, how do you choose? There's no theme to Discraft's line up either. Innova has the animal names, Discmania has the ugly stamps, Latitude has pretty plastic, Discraft has a clunky line-up of good discs that are poorly marketed.
As for the ace race disc, there aren't a ton of gaps left in their line-up so it almost has to be something a little redundant.