Another failed laser keyboard

Gizmodo, writing about the Celluon Laserkey:

“If it worked as awesome as it sounds, laser keyboards would be a fantastic tool for doing long form writing on a portable device. Particularly when it’s integrated into a $180-$190 iPhone case. But the sad reality is that they’re almost unusable for any kind of real work.”

These things don’t work and nobody wants one. Is it really so difficult to carry a thin, inexpensive Bluetooth keyboard around?