Great pedal for recreating 70s hard rock and metal sounds. As the name implies, it delivers a crisp and thick Sabbath sound. It emulates Tony Iommi's sound very well but can also be used to recreate some Led Zep tones, even Queen, if you add a compressor to it, to make it sound smoother, as the original sound is mainly brash (but not at all unpleasant).
PRO: sound & size. the pedal is smaller than the typical BOSS pedal. Furthermore, the knobs are high quality and you can dial pretty much every tone with them. Nice touch naming the volume knob "VOL4". Well played, Catalinbread.
CONS: the price, but I guess you expect it to be expensive. It really shines though and is worth the money. Another CON is that it can get noisy, if not setup correctly or if the pedal chain isn't well though out, for example if you have another distorsion/overdrive pedal wired in.
That being said, if you really want/need to sound like Tony Iommi, this is the pedal for you.