Before I start with what I think, you should know that it comes with a USB A-B (2.0 not 3.0) cable of 120cm. Very important as not a single review, neither written nor on YouTube mentions this, and you may be thinking of having to buy an extra as products nowadays usually come with quite short cables (<90cm).
Oh well. To be mini, it's good travel on the keys. High quality plastic the whole team except the pads of course which are pressure sensitive. The size is like a keyboard without a numpad so it is suitable for on-the-go or a mini studio for those who lack space.
The Arpeggiator + RGB is a big bonus hence the rating. Otherwise, there is not much more to say. If you are looking for a mini keyboard of 2 octaves with features, there is nothing better in the industry right now. Also check out loopop on Youtube for a little more in-depth.
One thing that should lower the rating and it's a big thing for me is that Novation's products (and pretty much everyone else in the audio / music industry) is that there is no manual switch. This means you will have a lightshow until the power goes out. So get yourself a USB hub with associated missing. It's sad but you have to live with it. This is of course a standard if the device can be powered by a battery, but a bit sad that it has not been a standard for all midi devices when it costs a few pennies to bring. It's a bit like living without a standby button on a remote control simply.
After playing with this for just over 2 weeks, I unfortunately have to lower the rating by 2 stars until further notice. This is because there is no way to tweak the brightness of the sad. It might come with an FW update. You simply have to keep your fingers crossed. It is very disturbing as it is on the Launchpad Mini MK3. And because of the above, it does not help directly either.