This is quite new @kona. It is really good that you share it to us.
As for my personal review below :

Pros :

• You can select a variety of music apps which really interest you. Almost all musical instruments are there and each of those applications are really easy to use.
• All of those sound effects are really in quality and it really sounds real-like instruments which can be good for creating music composition or anything that is in a group.
• It has received a lot of awards like AppyAwards 2017, Best Guitar Tool, Webby Award Honoree and many others
• Available on both App Store and Google Play

Cons :

• A good musical app, i cannot find any cons for this.