An often unmentioned - but very important - point is that the total stacking height of the little SS slides is _much_ less than Bat-Cars (either Harken or Selden).
I added a Strong Track to my then-new 05H36 to accommodate the custom suit of sails I had had Doyle make for me. (500sq-ft, 4-full-battens mainsail)
I can just reach the headboard to attach/remove the main halyard shackle, with no need for a mast step. Impossible with the Bat-Cars.
Even with the low friction of SS against the Ultra-High Molecular Weight Polyethylene of the track, the 1/4" mainsail downhaul I added is sometimes needed to finish pulling down that big mainsail without leaving the cockpit, as was the case in 30kts (triple-reefed, like the photo out by the Isles of Shoals in my icon) last Saturday.
However, normally the sail very rapidly drops unassisted between my lazy jacks.
After using one for more than 7,000nm between Nantucket and Penobscott Bay, I can say that if you have a compatible mast track, I think Tides Marine's Strong Track is the best thing since sliced bread.
Fair winds,
Al
s/v Persephone