Am not familiar with Roli keyboards but on a quick look the new keyboard controllers don’t actually have the traditional keys. Instead, the new keyboards make use of a new interface. They have pliable, pressure-sensitive keywaves that take the place of keys on a traditional keyboard. The sensor-embedded keywave surface lets you shape sound through touch. Three faders let you fine-tune the responsiveness of the surface to touch. Sounds pretty awesome if you ask me.