Funny you mention this - just started to dig into the 3 CD set as well as Firehouse.  Intense tenor sax trio music!  Anybody who likes James Brandon Lewis, late Coltrane or Albert Ayler will enjoy this.

Back in the 80's I used to occasionally listen to a Tommy Vance program on the BBC.  I forget what it was called but it was music "on the heavy side" as he would say.  In my view it was kind of lightweight musically but these bands often put on an impressive display of electric guitar virtuosity which could be enjoyable in and of itself, the tunes and lyrics largely simplistic and barely audible.  OK a lot of it was repetitive tricks and pentatonic cliches but it had a certain cocky majesty in its braggadoccio.   I don't know if my tastes have changed over the last 40 years. I still find the occasional shredder exciting but when I went through several notable Black Sabbath tunes mentioned in the newspaper, and when I listened to the excerpts that Rick Beato played in the clip linked above, I was struck by how rudimentary, obvious, and unswinging it all is.  The combination of third-hand blues mixed with English music hall and camp satanism, hyper-masculinity blended vaguely with an ethos hinting at drag-queens - not that there is anything wrong with that - does little for me.  

Now:

Bump...still a bunch of stuff available.