MASCHINE JAM changed me. And... it's gone now. Used models are available. Been thinking about a backup... the touchstrips allow for such a variable and expressive control, while allowing you to decide the notes or chord structures to play within (and eliminating notes you don't want so you don't hit a wrong note). Life-changing for someone who struggles with guitar, and mediocre on a piano.
But, the Era Touch by Embodme (or some such) is absolutely the bad'st MF-er I have ever seen. OMG I can't afford it now, but I will own one as soon as I can. It's not just one controller... it's every controller you want, in a customizable and 100% touch/velocity sensitive surface that responds to hands, drumsticks, empty paper towel roll... amazing. Need it.