I use it for 3 months.
The concept is interresting. On a desktop, it does not take much more space than a standard keyboard and is actually quite ergonomic qaund we do not use the keyboard for notes (covered by a cache).
It is true that a USB connection would have been smarter, but it is a model "old". on the other hand, it is therefore essential drivers for the "piano" keyboard "normal" being recognized without problems.
Its biggest flaw is the response time. I tried with several software and it makes no difference. They recognize good, but the latency is terrible. I have nothing to measure it, but at first glance, it sometimes borders a quarter or even half a second. result, not only the sound is offset from the strike, but the dynamics are not met, if not disappearing notes!
The software of "music" is delivered with ininterressant. A kid playing with five minutes and that's it!
The only interest is to have a "guide vocals" on hand, or to entering into a partition editor (which is why I bought it).
Paid € 30 for OCCAZ, I did not take too much risk, but it is not worth more.