Wonder too but dirt is harder on ball bearings..... and even ball bearings wear out eventually. I am more curious about the friction to overcome ..... Time will tell.... next season...That sounds like it will wear out or get dirty and bind.
Looks like a friction fit as far as I can tell....How are they installed? Friction set like a wiper blade or is there a set screw internal at the end of the slide.
I have a recessed track on my Hunter 31 and the 1” ones fit mine just fine and mine are older with the bearings. You are right the “normal” ones won’t fit a recessed track. You just have to let the Garhauer folks know what you’ve got.I was unaware that they changed to the self-lubricating slides, that would explain fitting in the recessed tracks now. I have used the slides in the past, keep the underside of the track clean, they tend to get dirt and it acts like sandpaper.