Hello!
We bought Soundpiece and tested, what can I say, the result was not very good. We use Soundraw and Mubert almost every day. Mubert is in a league of its own, Soundpiece is the closest thing to Soundraw, although the difference is huge. soundraw has a mini daw where you can edit the songs even more. This feature is completely missing in Soundpiece, also the choices of which genre to use are very limited. The sound itself is very monotonous compared to the other two providers and offers no surprises, unfortunately.
This opinion reflects the result of our team (14 people). Please do not be angry, that is how it feels to us.

with kind regards
Cris & Team