I went trough a lot of speakers over the years. I've had pre-ROLA 20's, 25's, 30's and Silver Dogs. Celestion black backs, cream backs etc. I also endured listening to a current production Celestion G12H - it now serves as a paper weight. The Scumback SA12-75 and the SA12M are the best Celestion type speakers I've ever played through. The SA12-75 is modeled after a pre-Rola G12H - I've had a few of those myself, but prefer the Scumback. It's got a very forward midrange and is bright in a musical way, not like the current production G12H harsh ice pick action. It's got a modest bass response, which will make your bass player happy. As you turn up, the speaker starts breaking up in a controlled way and can get pretty aggressive. And of course, speaker breakup can be an essential part of the tones we've come to love and persue. Now the SA12M - if I could have only one speaker, this would be the one. man, I'm so jaded and impossible to please, but I couldn't stop playing. The M is not as bright and forward as the H but breaks up a lot quicker - Strats and Teles love it, so do I. Both speakers a very lively and have an awesome bounce to them as you play. This test was done with a '64 strat, '59 Tele, Div. by 13 9/15 and a Blockhead '63 JTM 45. The speakers were wired with Cardas Crosslink wire. And no, I don't get free Scumbacks from Jim.