Back in the olden days, the general consensus was that Master Volume Marshalls were not the way to go. The core tone was better on Non-MV's by old school cranking and/or using a pedal or two to get a good rock sound. All my Marshalls are Non Master volume and this is how I use them. Come full circle, ironically I have 'discovered' that one of my favourite amp sounds from Helix LT, Digital gear is the 2204 (I think JCM800) model. This has a great solid rock sound and cleans up to a degree with the guitars volume. I have never tried a real JCM800 thinking that between my JMP 1987(1970), JMP 1959(1975) or JTM45 reissue (combined with turning up/pedals) I would not achieve a 'better' sound using a more modern amp such as the JCM800. All this is very subjective but I would be interested to know others opinions on this and their journey.