A good extra keyboard. The product keeps its promises: reliable, efficient, small and portable without being unpleasant to play. For use as I do (use as a medium of MAO noon for software like Cubase), that's fine. By cons, if you want to play Chopin, go your way.
In short a very good working tool.
One criticism though: the lack of notice is regrettable, especially as the use of the menu is not at all obvious. It is against easy to find on the net to PDF, you just need a little patience.