I don't particularly like it. Even when used as a preamp, the high-end or high mids have this kinda plastic-y voicing to it that sounds so Metal Zone-y.
That being said, I love Slaughter of the Soul, and that pedal was part of that tone. Crowbar and Cannibal Corpse also use it as a boost, no?
When I was young and that came out, it was Metallica in a cheap pedal before the amps that do that were available to us poors. I've seen guys run that into a loop return on amps and use it as a preamp and it does that job fairly well there.
I'd say I like it more out of nostalgia than practicality.