Marshall Studio Vintage SV20H

Once you figure out how to dial this amp in it truly is phenomenal. It's an absolute powerhouse of a head, don't think for a minute it won't be loud enough in a band scenario.
There is one major flaw which meant I had to return it. This issue is not specific to the SV20H but more in general an issue with non master volume amps. If you have a lot of a gain thundering through the amp the loop becomes completely unusable. The loop is so overloaded with signal that you can't actually hear the effect blended with the dry signal, that is until you stop playing and then all of a sudden the tail of the delay / reverb jumps up abruptly.
If you to plan to use this amp as a traditional NMV amp then you'll absolutely fall in love with it. If you plan on using reverbs and delays in the loop you'll be massively disappointed.