The person who told you "you can't reef with a CDI" is completely wrong. In fact that was it's main selling point for me(that and the guarantee). You can and it's as easy as it gets. Head up to the wind
, pull in as many wraps as you need for conditions, recleat the furling
line, fall off adjust sail. It takes about as long to type it as it does to do it.
This is my 2nd CDI (2 different sizes and boats) and I'm very happy as it makes sailing single
handed so much easier and safer as I dont have to go to the fore deck
just when things start to get dicey.
The larger models have a wire halyard built in and the metal slug has a short line attached that secures the tack and tensions the luff. I think that what he may have meant is you can't adjust tension as easily as on a regular jib by using a winch
on the halyard and that IS true. I use my weight to tighten by standing on the messenger line and while doing that tie off the tag line.
You will have to tighten things up the first time you put the sail on the furler or you will get a baggy roll.
You should have a sacrificial cover sewn on your sail as putting the sail up and down every time you go sailing is a real hassle and if you don't have a cover UV will eat your sail up in a short time if left on the furler.
You can get a complete set of directions on line if you hunt around the CDI home site. Good luck and ejoy............