I have had a Raven for over a year and really love it. I have it and the Softube Console 1 and use them both everyday. Mostly, I feel that a touchscreen saves me a hundreds, sometimes thousands of mouse clicks a week. It just makes sense to me to reach out and touch the wave file I am editing, to scroll thru the project by touching the screen, to touch sends, plugins, channels, to move faders and switch easily between windows and arrangements.
With that said, I don't know if it is worth it if your primary interested is in speeding up your midi editing workflow. I find with a pinpoint stylus I can get in pretty detailed moves but things like moving the edge of a midi note are probably the most difficult tasks to accomplish with touch. I often reach for the mouse to get that precision when grabbing an edge of a waveform or midi, etc.
I personally love the workflow of a touchscreen and the Raven has been great for me personally. I try and challenge myself to only touch the screen but it is basically impossible. It is a three way cooperation between Raven, Mouse and Keyboard (and Softube for mixing). But the combo has sped up my overall workflow.