We used to break out a few of those during job interviews. You can learn a lot about a prospective CCNA+ applicant by their reaction... Priceless!
We didn't ask stupid questions. We'd sit you in front of a few routers, give you a problem, and heckle from over the (4ft) cube wall.
(the ISP world is a stressful place.)
(I think they were originally 3000 IGS's, but there aren't any numbers on them)