the ValBee is a full tube unit so it does give off a tube tone, no doubts about that. the sheer size of this amp is the very subject of scrutiny- the default driver doesn't manifest enough bass to put the tubes to good use IMO. however, that's the ValBee in stand-alone use, with pedals attached, it's another story as i've found out.
the amp begins to show its true potential with the volume at about the half-way mark, anything less, it sounds under-driven & rather excessively fuzzy. i've made my EQ/ Tubescreamer/ Micro Amp pedals as permanent supplements for the ValBee in use. with these attachments at the helm, the amp is capable of fulfilling many genres, metal included.
in any case, if you are an interested party, do try it out in person, however, the amp per se might sound lacking to many of us, myself included. its basic tonal performance is a very pleasant sounding platform to further your individual tones.