I was hesitant to buy this app for awhile given the price tag relative to other apps, but having used it for a few days it is definitely worth every penny. It's probably the most hassle-free method of getting a control panel onto a mobile device, It's getting very regular updates, and it sounds like the author is extremely active and ready to help with issues.
The only things that would make it better is if the MFD's displayed information, but Reading through this thread it sounds like a commonly requested feature so I'm sure it's more complex to add in than other features.
I'd also love to have vibrations as feedback when hitting buttons, I think that would make the panels much more satsifying to use.
Thanks for your work!