It can be good, but the generic term "brick" has gotten associated almost exclusively with bad Mexican. It's basically just very compressed to make shipping easier, and can be excellent to very poor. I haven't seen any in decades.

A great pot movie is Cisco Pike, starring Kris Kristopherson as a musician ex-con who makes a deal with a corrupt narc, played by Gene Hackman, to sell hundreds of pounds of very good stolen Mexican weed that is in brick form. thumbsup: