I have met several Dis-ers on my trips, and I am always looking for lime green "signs". However, I can say that a button is hard to spot. The easiest one to spot was Luv2roam, she had a big floppy, loopy, curly lime green ribbon tied to her lanyard. I was able to spot it from twenty yards away as she passed me at Epcot. If she had been wearing a button, no way would I have noticed her. Dis buttons do work well on packs though, so you can see them on people when you are standing in line. I like the Home Depot mickey heads or the Dis keychains, things that can hang off of a pack or something, so they swing around and get noticed. Tshirts would work well too.