Roy, We added the Tides sailtrack to our 35' sailboat last year - made a huge difference in the grief factor when dropping/flaking the main. Last weekend I had the mainsail
reefed. I was concerned about the lateral pressure either pulling the track from the mast
or the slides from their plastic slide material. Fortunately, no such problem and all was OK.
Shop around a bit and you can save on this. Installation
is easy: about 2 hours to remove the old slides and replace, along with new battern pockets + cars. About an hour to slide the track in place and relead the main. So far, very satisfied.