I own a VS100, had to use it for a while with a bad old cabinet without any boost or stuff like that.
Didn't sound that good at that time, the last time I used it I had a noise gate and a boost in front of it,
an external eq in the loop to boost some hi mids, cut some lo mids and some hi and it
sounded way better, played it through a harley benton cab, but with vintage 30s, not really crushing
or anything like that, but quite good for an amp that cost me 120 euros.