Hmmmmm... a distinctly tricky one, this. Essentially, there's nothing *wrong* with this tiny wee gizmo... which might lead some to think my 2-star review is a bit churlish... but even at the giveaway price, I just wonder whether it'll ever find a usable niche in anyone's serious music-making.
For a start, I'd urge anyone considering buying one of these to have a look at the dimensions. It's 15cm long. Which isn't very long at all (it's about the same size as, say, a scientific calculator). This means that the internal speaker is tiny, the 'ribbon' is minuscule, and the rotary controls are even smaller. Being the shovel-thumbed man-beast that I am, this made adjusting anything accurately almost impossible for me... while actually trying to use the ribbon strip melodically (or even trying to isolate an individual note with any accuracy of intonation) was a frustrating waste of time. Forget that fact that this has a piano keyboard printed on it; you'll never, ever coax a TUNE out of the swine (even using, say, a stylus from a PDA).
And secondly... lord, it's a flimsy bit of kit. 'Kinder Surprise' build quality, really (and I'm talking about the chocolate egg, here - not the toy inside...).
So while it *does* do everything it says it will, the limitations in the execution render this device - for my purposes, anyway (adding some nice, chewy analogue synth lines to some lo-fi bedroom indiepop) - a complete non-starter.
Forewarned is forearmed and all that.