I am an amateur electronic music composer, and have been tinkering with pianoteq from about version 2.
The sound in version 4 is really incredible, my favourite preset being the cinematic, so far.

But this random improvised piece was made with version 3.6, albeit the final result being lowered in pitch and speed ever so slightly:

http://snd.sc/KQzY97

There's a couple of mistakes, but I think they fit in quite nicely with the overall clumsy feel.

If you have any comments or criticism, by all means fire away

Thanks!

-Tony