Has anyone owned, used or tried out this keyboard MIDI controller? I'm looking for an 88 keyboard or controller with a lot of knobs, and extra buttons to control just about anything and this looks like the one for me. I just want to be sure it'll really do what I need it to do. Looking for reviews about the keys compared to an acoustic piano or synthesizer keyboard? and what about the knobs, sliders, buttons? If you know of a better product within the same price range, please say so.