I had bad experience with NI-HW....
I had the KORE 1 and the Maschine 1 and BOTH did not "live" so long by " normal using!
The MOST stuff (of booth)  lives still today... but the KNOBS begann after 18-22 months to react to a "wind" in the room.... 
I JUST moved Knob 5 and Knob 8 will ALSO react (per wind/infrared.... i dont know... BUT it happend... i reported this to NI but say just give 10% to upgrade, or so, instead an awnser)...
- How WORKS your knobs after 2-3 years of 50 hours/per week or so using???
 - Do you turn the on/off  main-button 
 - How often and how "intensiv" and what "tools" do use , to clean your M3? 
 
Thanks, but after this "-time-Experience with NI-HW (knobs)... i need INDEPENDENT reports! 
Thanks!