It's rare or obscure because I've never seen another 1975 Marshall 1959 SLP with so many mods.
Clean channel, drive channel and adaptable solo boost...all footswitchable.
Very good effects loop that can be fully bypassed.
Resonance control.
3 Way bright switch.
It all depends which guitar they're in...
I've got a H3 in this one in the bridge position :
The guitar has a basswood body with maple top.
I would describe the sound as too much treble (or high mids if you would call that) and a lot of bass...
It's lacking lower mids.
I have had a SH-4 (JB) in...
The tour with the new line up (featuring Tommy Aldridge) started on 20 June 1987.
And "Girls, Girls, Girls" was released in May of 1987.
So definitely not 1986.
I had one for a couple of weeks, sold it because there was a hum that became very annoying when using high gain. Tried it with 4 of my amps and had it with all of them. Tried it at home and in my rehearsal space. It was the only pedal that gave me this hum. I bought it second hand so maybe there...