Re: in mast furling issues?
the worst case isnt dropping the sail when its unfurled, you just release the halyard like on any main. The real problem is when it gets jammed halfway up. Then you can't drop it, or furl it. The only options are to either fix the furler right then, or go up the rig and cut the sail away.
We had a in mast furler for 15 years, and never had a problem that wasnt caused by poor technique. But I was always worried about what if... I wouldn't own one again if I could avoid it.