My wishlist for new version of S4: - Better build quality. One of my channel faders doesn't align with the markers (known issue). My switch desk button is a bit sticky as well. And finally when moving the S4 around the plastic 'creaks'. Similar to a cheapish laptop vs the solid feel of a macbook pro. I'd be willing to pay extra for better build quality too, if it is a cost issue. - Hard to see EQ and filter in dark environment. Would love soft LEDs for next version. - Glossy middle looks nice until you start using it and then it looks smudgy and not so nice. Alternative matte version would be more functional in this respect and also look cooler IMO.