They are on the Snap last. They fit just like the Hampton, but with a rounder toe. They're clearly not on the Aberdeen.
I actually have this pair.
TZ Laces are really quite sturdy, here is a pair on my Vibergs. I only wish they made a darker brown.
Benjo as well but I have not tried them personally so can't speak on the durability.
@tricky you need to plan a trip to NYC and head over to Leffot or Alden Madison and just try on everything. I did exactly that when I was in NYC last September.