Reefing vs. furling
The problem with the Hood LD system is that it is rated only for furling the jib, while many people want to be able to reef the jib. Hood sells an "upgrade" that replaces the LD drum with a single line drum. This is capable of reefing as well as furling. You can still use the existing foil and halyard swivel, so it is less expensive than buying a whole new unit. There's lots of discussion of this in the archives. I've been considering getting the upgrade, but the old LD system meets my sailing needs so far.