Router table miter slot, who uses them?

Calandis T-track Woodworking T-slot Miter Track Jig Fixture Router miter slot track Armor Tool AnchorPRO Mitre Bar Set for Mitre Track and T-Track Track T-Slot includes Mounting Hardware * Please insert a quantity miter slot bar Precision aluminum miter slot accepts any standard rectangular 34'' x 38'' miter bar—promises smooth-sliding and unerring accuracy More details $

miter slot track +1 on Myk Aluminum combo track here If it wears down, I can replace it easy enough