I see complaints about tablets for jazz gigs from time to time on forums, but the pros around these parts don't seem bothered by them, and glancing at them doesn't appear to affect their playing.
For our next planned gig I'll need my iPad for one piece as it's hard to remember and not played often, but could play from memory for the rest.
So much stuff that's unfamiliar, or boring (makes it hard to remember), gets called at jams that I couldn't get away without one. Plus, my jazz skills are never going to be up to transposing on the fly for singers for anything but the most basic of changes.