It sounds like typical over compressed drum samples that use very little ROM. The sound quality is OK and the dynamic range is good but I can't stand the over compression on the drums. At least they are using velocity switched multi-samples which is a plus. They're still quite a bit better than most keyboard and arranger drum samples. My old AKAI and Fairlight drum samples are leaps and bounds above those samples though. It's a shame when a product made today can't compete with the audio quality of one made 20-25 years ago.
One of the primary reasons I love the Wersi is because I can load and play all my AKAI samples and sample new sounds from my Fairlight into the Wersi. I get the best of both yesterday and today.