Welcome, @maxmoioli! I hope you'll have a look around the community here, see the great range of discussion and exploration we all enjoy together.
I really do think what you achieved with Mine is lovely, and I hope to try it out one day. I sure I'm not the "target customer", I was only looking at it from my own musical path:
My needs are for MIDI controllers that can stand up to live performance, being hauled out to sessions on a regular basis. I need well built quality gear - it is my musical instrument - but there are other factors too:
- Size is at a premium - I only have some much space to put out my rig at the venue.
- Cost is important, because replacement is inevitable.
- It needs to handle being transported all the time.
- Flexibility and adaptability is important: Electronic musicians are musicians of an evolving instruments - often evolving from performance to performance.
So you can see, a modular MIDI controller is enticing, but difficult to balance the needs.
In the Special Waves case, I compared it to a common alternative, a Novation LaunchControl XL. Both, "8 strip" style MIDI controllers. The LC XL has 8 faders, 24 knobs, 16 smaller buttons, and 8 other buttons. On Kickstarter, this is pretty much exactly the Mine + Brown bundle. Indeed US$150 to €640 is pretty much 4x the cost. Size wise, 240mm x 240mm vs. 330mm x 270mm is 35% more in the largest dimension (and 50% in table area).