Excellent drum synth and value for money. It is a digital synthesizer and stereo! It requires some learning to compose from scratch. Personally, I find it easier to tweak the preset sounds. You can create drums for all music styles, even snares that sound terrible in beats.
Like all Volcas, it does not come with a power supply in the package, and it lasts about 6-7 hours with batteries. I recommend checking out the 5V myvolts adapter, which can power up to 5 Volcas for 16 euros.

Update 2021 - I consider it the best Volca released so far. It goes beyond just drum sounds in terms of composition. You can create effects, bass, and even piano sounds. Its step jump feature is excellent for performances.