I've got one. (roll up piano)
Key feel is like playing a car floormat.
Polyphony is limited about 8 notes on mine.
However, I have had mine for almost two years.
Maybe they are getting better.
I tell you this in all honesty...
If the sound source could be made by yamaha or roland, there would be NO question about rather to buy it or not. The portability is awesome. It is very playable. It just needs a better set of sound samples.
Regards,
Dennis L. Almond
aka...TwoNuts
[This message has been edited by TwoNuts (edited 01-29-2007).]