I have a '72 Hiwatt SE412 with vintage Fanes. I love love love it for cleans to cranked vintage Hiwatt with a Treble Booster or OD crunch. Vintage '60s to '70s hard rock with a fuzz, some more vintage sounding Doom, stuff like that.
I'm not really a fan of of it for modern high gain tones. Maybe with different speakers, but I think some of it has to do with the rear port. For really thumping palm mutes and good high gain metal tones I tend to stick with a non ported cab. Either an Avatar Vintage 4x12 (like a Bogner 4x12B), Electric Amps/Matamp "Green" 4x12, JCM 800 Bass 4x12, or Lopoline Sig 4x12.
A Matamp "Black" 4x12 would look pretty sick under that head, and thump like a mother fucker. Great cabs. I have mine loaded with two alnico EV SRO's and two Celestion G12H100's. Massive lowend punch, and fantastic articulation across all registers.