[please keep in mind re the black band that the tack on the pin is exactly where it is going to be with or without a slide of any design on the boom]
after 2 weeks with my first j30 in 1982, I realized that the bolt rope thing was geared to big crew and switched to slides then. The slides needed some sort of lubricant to work adequately. and then you had to clean the track a couple of times a summer. I was able to get away with just one of the two slot plates as the slides sometimes hung up at the slot with the two plates installed.
When I originally switched to Tides on #505 about 9 years ago, I had run though 4 different slug designs ... all claimed by Shore and North to be the answer. Didn't really work as promised, but I saw the Tides track on my buddy's mainecat 30 and it was the answer. Here in NPT I am now sailing on a new J22 from Sail Newport
and it has new slides ala north and they are horrendous. you have to pull the sail down as the slides half way down just hang there.
with tides you can blow the halyard and the sail will drop to the boom, but it isn't all that easy as we like to at least flake it at the mast so that it doesn't all bunch up on one side of the boom. so it still is a two person job. one to flake it right left right left at the mast and one to keep it from falling down too fast.
And after 9 years, the plastic is starting to show some deterioration. but the last 6 years have been in florida sun.
note in this related thread that the kids jumping the main are doing it without need of a winch handle -- except perhaps the last couple inches: tides track installed
Those two kids are still on J30s with tides marine tracks as it turns out.