I really like this one, a really nice, very usefull electric piano sound. The user interface is the host's one (slider box, or whatever), but that doesn't matter when you start to play it.
The default sound makes me want to play old Stevie Wonder riffs (Sunshine Of My Life, In the City, etc..), or jazzy II, V, I, progressions. With a bit of tweaking, you can get it to sound a bit like a Wurlitzer, then launch into some Supertramp riffs.
I personaly like to use a piano for coming up with new song ideas, because a good piano is very expressive and you don't get bogged down with the sound (electric or acoustic). This is a great one for that, within half an hour of downloading it, I had written a new tune.
Of course, writing songs on a piano isn't for everyone, and I certainly don't write all my stuff that way. But this really is a great one to have in your VST folder if you like E Piano sounds.
User interface, manual, and customer support aren't really necessary with this one. It does what is expected. However, I wanted to give it a good mark so I've awarded points for those, even though they don't exist.
To sum up, I reckon this is the BEST free electric piano out there. Get it and see.