Now the HM-2 has some very usable sounds, esp with right guitar and amp setup, but methinks its not really a $100 pedal - check out the other pedals listed by the seller... seem a bit out of whack to me...
Despite the fact that it has been discontinued for over a decade now, it is still a very common pedal. In The Boss Book it was in the top five for production volume (circa 2001/2002). Definitely not worth $100. I got mine for under $40.