This pedal is part of Blackstars HT range of tube driven effects pedals. The HT-Dual is one of seven distinct drive pedals in the range and sits in a position that makes it probably the most versatile of the bunch. Similar to the HT-Metal, it is a two channel, foot-switchable, distortion pedal; with a drive circuit that is powered/flavoured by a standard 12AX7/ECC83 pre-amp valve.
I've been using for about a year now in a whole host of environments and usage scenarios so I thought I'd share my experiences.