I am thinking of trying it out with an HP Touchsmart tablet and my S4. I would use Emulator to take care of non-latency critical jobs like browsing and well, whatever else. I plan on getting the trial download but wanted to see if anyone had any real experience with it?
I was very tempted to try the software out on it, the m90z is a very large multi-touch interface.
In the end I realised that after my ventures onto ipad + touchosc etc that it is largely the same but bigger. My one gripe with these touch interfaces is lack of tactile control. Moving a virtual knob with your fingers is not very fun for me. It is also hard to be accurate and fast I found.
So tldr version, it is like a big version of touchosc, lack of tactile feedback its main downer.
use virtual faders instead of knobs. colour-code them so that you can distinguish knobs-turned-faders from what was a fader to a begin with, if you cant just remember it. I think it much more useful than virtual knobs, plus you can jump between values.
If you are use to using touch screens, then go for it.
The only thing I would suggest is a large screen.
Nothing smaller than 20".
Mine is 23" and the Emulator software works great!
Make sure to check their screen compatibility list too!