I would run the other way from in-mast
furling, for the reasons mentioned above and:
1. noise at
anchor from wind whistling in the slot
2. "Operator error" most likely at most inopportune moment
3. lack of battens making sail shape a nonsense term
4. lack of battens making sail noise (flapping) and wearing sail out sooner
5. vertical battens (if you have them) that WILL poke through their pockets and get stuck inside the mast
5. reefing keeps sail area high on the mast when you want it there least
6. how to fix things that jam 20' up in a 5' sea (it won't jam when it's flat)
It sounds to me that though many people may profess to enjoying their in-mast r/f systems, they're like the fox who lost his tail in the trap. Boom-mounted systems, though they may have some of the same and other issues, seem to make much more sense.