Total
Handling
Features
Sound
Quality

Will never part with it.

I think this should be consider an instrument in itself. Why? Because there's a learning curve to getting to know how to properly use it. Fortunately it comes with a really comprehensive tutorial. Once you learn how to use it you can do much more than the post-rock swells it's so well known for. You can emulate flute and cello sounds for example. The only thing I would like it to do more is conserve battery life better. And maybe bigger on/off switch.