Nunsuch's are sneaky fast on a reach, the underbody is definitely a modern design which catches people of guard at times, but I do have to agree that they don't point as well, it's just a limitation of a cat rig and the overall intent of the design.
The
interior volume is generous for it's size.
Figure out where you'll be sailing and in what conditions and then make your decision. I sail the
New England coast and for some reason it seams I'm just about always sailing upwind, it's just life I guess. Don't choose a rig based on your
current capability, choose it on what you feel will fit your needs, you'll master whatever rig you choose in a short period of time. If the cat rig fits you intended use, go for it.
I've looked over a couple Nunsuch's at
insurance auctions, in which case you really dig into the
boat before making an offer, I was impressed with the strength and quality of the boats.