I don't use it - don't have a need. Been tying too many years without one and the jigs & flies work fine. If you have to fill up spools to use it - where is the time saved using one? And you have to have something to load the spools.....
Ya thats what I don't understand got to spool thread and buy more spools . For that kinda change I can buy a lot of Griffin Bobbins . Plus if the ceramic gets broke your screwed .