The only issue with the Marshall Guv'nor MK1 is that it was produced for four years only. In the late '80s Marshall decided to recreate the legendary tone of the hard rocking JCM800 as a pedal effect and from 1988 till 1992 they did just that. The Guv'nor MK1 is a lot of fun to play and definitely delivers that full power Marshall tone which made the JCM800 a staple of the '80s rock and metal sound. There is a debate whether or not the Drive Master which came into production early '90s is a direct replacement of the Guv'nor. We did not compare the circuits but sound anyway is what matters to us players, so go ahead and add both to the player for a true AB comparison.