I bought a Akai Professional MPK Mini midi keyboard and unfortunately one of the white keys did not work. If we consider that the keyboard only has 2 1/2 octaves, a bad key really affects the flow of things.
Akai pro did fix my issue a few days later but I still feel that took longer than it should've, I have to say that after the fix the live 2 is a Swiss army knife of a drum machine / groovebox far better than NI Maschine, just gotta get through the slight learning curve...