I Heave to my C30 most times that I am out sailing, in all wind strengths. It is useful for eating, cooking and (most importantly) using the head!
It is most handy anytime that you want to stop sailing to do something else without screwing with the sails and getting rolled about under bare poles.
Having taught several club classes on the manuver, I find that most sailors over think and over work what is really a simple procedure.
- The sail plan should be correct for the conditions. ie, under 15-knts full sails, over that reefed to the correct combination
- come to a close hauled course and sheet tight
- tack the boat through the wind but do not touch any line.
- as the boat slows down turn the helm to try getting back on the previous tack and lock it.
- enjoy.
I have done this hundreds of times in wind from 5 knots to 50+.