Like all batteries FIRST they are excellent, the quality of the drums (chamfers) are excellent, the drumkit comes with a cymbal, hi-hat cymbals, all skins and a stool.
Of course it comes cheap but it takes almost all changed this amounts to 900 €
The best way is to change the whole hat (cymbals + pedals), leather stamp + snare (except bass drum makes a good sound), the cymbal and bass drum pedal! After all these changes is as if you had a drumkit that will produce high quality sounds excellent!