Great controller, but there is room for easy and cheap improvement. For example, Line 6 is keen to point out that this is the first full-size controller-keyboard which can be plugged straight into iDevices, so with that as a major selling-point, I kind of expected to see a removable/retractable stand at the back to hold tablets and phones at a convenient angle while you play. Also the addition of a charger-socket and a 'wall-wart' AC adapter would keep an iPad etc charged while you concentrate more on making music and less on whether your tablet's battery is about to give-up half way through recording your masterpiece. Neither of these things would add massively to the price yet they would enhance the useability.
Computer-users would surely welcome the inclusion of a USB cable: why can a guy in China sell me a one-meter USB cable on eBay for 99p plus shipping yet the manufacturer of a £100+ controller-keyboard can't throw one in for free so that computer-users can use the keyboard straight out the box?
All that said, it's a great controller keyboard, it's light, it's built good enough, and it responds well. It slips under the front of my 2011 iMac as though it was designed to fit right there, and getting it to work with either my iMac or my iPad was absolutely painless and fuss-free in both instances. I plugged it in and it just worked. Instantly. Be warned though, I've read mixed reviews from Windows users, some of whom have had difficulties because Windows seems to insist on downloading drivers for it that don't always download/install properly. But that's Windows for you.