My favorite of the three tapes has to be Shackles' "Dissolve to Nothing" EP. Metallic hardcore with some powerviolence influence - this is right up my alley.
Next up is the demo from a duel male/female fronted powerviolence band; Nazi Dentist. This one also rules.
And finally the Menace to Society demo. If you didn't know any better, you'd think this band was straight out of Boston. Great original Boston Crew influenced hardcore.