Pretty sure the OB we have is the latest one, it was bought maybe 3 months ago. We have had 5 different keilwood shafts, two custom ones, the OB, a Hsunami and some other one. None of them have a hit or deflection like the Revo or Ignite, they all still feel like wood shafts, but are a bit stiffer. We have had a few Hsunami shafts, one of them was pretty close to the feel of the Revo and lower deflection than the other wood shafts, probably similar to a Predator 314-3, but not as little as the Z or the Revo.
The other model CF shafts are a lot more similar to wood ones, and we tried pretty much all of them either owning them for a bit, borrowing from friends or at SBE, they are really a sideways move from an LD wood shaft vs a new type of shaft, Revo and Ignite are the two I think stand out as truly different. Another pretty good CF shaft we just got is a Tickles one, on a break cue, that has a pretty good hit feel and different from a wood shaft.