The Decksaver for the Arturia Microfreak is a solid piece of plastic that perfectly fits the top of the Microfreak, offering protection for the keys and knobs area. The fit is excellent and snug, and the thickness of the plastic provides high quality protection for the top. That's it.
If you're looking for protection all around, then this isn't it. The back connectors and bottom are fully exposed. The Microfreak is quite solid, so the main issue is what the Decksaver covers: the knobs and keys.
In summary, an excellent, quality product that does what it says on the tin. :)