Well I've risked it on over a hundred gigs since I bought it a couple of years back! Not been tempted to upgrade just yet particularly as my first, much posher, tablet got trashed on its first outing by a drunken punter at a fancy function gig when he fell and knocked over my mic stand! But you'll get better quality from an iPad, for sure. Plus you're purely reliant on a tablet whereas the CQ12 & 18T have excellent screens which makes using the tablet optional.
I've not needed to use it wired, fingers crossed, as I make sure my tablet is fully charged before leaving the house. The key tip for connectivity has been to switch the CQ from 2.4 GHz to 5GHz - made a massive difference.