Yea they suck if it is rough. They will not stay closed and have to be reset constantly. I tried to move the magnet to get them to stay engaged, than they wouldn't release when fish were on. You had to fight the diver and the fish all the way to the boat.
I gave them away after the first trip. Sorry I can't help with set backs.
Stay with the tried and true Lure Jensen Dipsie Divers.
The medium will run about the same as a "0" dipsy with ring and the large about the same as a "#1" Dipsy with ring. If you have it set out at a 4 or 5 of course it will not run as deep. I don't use them as much as regular dipsys, but have never had problems. Sometimes it is hard to adjust the magnetic trip. My one partner traded me all of his Kastaways for Dipsys. I have two other friends that the Kastaways are all they use.