Joli: We have huge roach full batten sails
with 3/4" round solid battens (7 in the main, 6 in the mizzen), resulting in huge batten compression
Up till recently we used the mast
internal track with Battslide hardware
. These slides were about 3" long. The intermediates were special Bainbridge slides that contact the tracks both on the inside and outside.
The trick to raise this is to loosen the boomvang which cancels the compression force. However, during sailing the forces are there and we had to replace intermediate slides often and the internal track was worn out causing jamming etc. It became a pain.
We selected the Antal 50 track that basically uses cars that are sliders, 50mm (2") high. The track is anodized aluminium and the sliders have new-tech inserts that contact the track and are very dense and slippery (teflon?). I do believe the inserts will wear out but that's much like the bearing balls on Harken and easy and cheap
to replace. The main now stacks 80 cm high; the old setup stacked 84 cm high ;-) Antal isn't cheap but costs much less than Harken.
I am sure you like the Harken cars, they ought to be very good for the amount of money you have paid for them. And the uncontrolled lowering of sails
(let go halyard!) is something to be avoided regardless of which system you have. But friends of ours had a little accident
and the sail came down so fast and violent that they had a lot of damage (cars broke through the bottom stopper!). I think there will be boats that really need the harken system but I think they will have masts 100' high or more.
I never saw that Y diverter and wonder if it would work with our sails. I think that the first half of the sail will block the path for the second half.