I just picked up a DL1608 this past week. Got a chance to play with it for about a rehearsal and a half before putting it into action at a gig over the weekend. Let me just say, I'm really happy with this purchase.
It was trial by fire, almost literally. It was an outdoor venue on a rather hot day with barely enough shade to cover the band. We'd only done a complete system setup once before, and the second time was quicker. I had the iPad streaming music thru the mains before the drummer was done setting up. But within a few minutes, the iPad shutdown due to excessive temperature. (Note to self: need to buy a small umbrella to shade the board when playing outdoors.)
Our sound guy used the iPad wireless during the set, and then re-docked during breaks to recharge the batteries and play break music. At one point, all the docking/undocking caused the iPad to lose sync and a quick reboot was required. (But since it was during a break, no harm done.) What we heard back from folks familiar with the band was that everything sounded so much clearer, crisper, etc. Our sound guy could move around the venue and make adjustments as needed without having to travel back to the board (which is usually located next to the stage). Going forward, I plan to leave an iPad in the dock and have our sound guy use an iPad Mini out front.
The sound guy does not have a lot (i.e. any) experience with iPads, so navigating was a bit confusing at times. The iPad would "sleep", and he didn't understand the concept of waking it up. Or he would accidentally bring down the IOS Notification Center screen while swiping between panels in the MasterFader app, or accidentally press the Home button and find himself back at the main screen.
Fortunately, there is a way in IOS to lock/restrict gestures and navigation within an app. Go to Settings>General>Accessibility and turn on "Guided Access". Exit Settings and start the MasterFader app, then triple-press the Home button. This will start up Guided Access Mode and restrict gestures and navigation to the current running app, in this case MasterFader. The Notification Center panel will no longer appear on swipe down, nor will the Control Panel appear when swiping up, and pressing the Home button once does nothing.
The first time you enter Guided Access, you will be prompted to set a passcode. (Make it a simple one, e.g "1, 2, 3, 4", since you're only trying to disable unintended navigation.) When you want to end the Guided Access session, triple-press the Home button again and you will be prompted to enter the passcode that was set earlier. (This is why you want to make it one you'll remember. Guided Access is really intended for use in a classroom setting where you don't want a student to leave the application they're using and do something else with the iPad, like surf pOrn). After entering the passcode, you have the option to end the session, resume, or set other options.
Anyway, I'm really looking forward to playing with this some more. As I said, I'm pretty happy so far.
-Alan