I've been using an ipad for music since the ipad 2 came out, 2011ish? I guess about the same amount of time as Don. I don't use it for every gig, as sometimes paper is still easier for me, but especially on those gigs where there is a big fat folder stuffed with music, I find it to be a huge time saver.
I currently use the 12.9" ipad pro which is really nice. If you crop very carefully you can get away with the smaller screen without making it a whole lot smaller than the original paper copy, but it's so much easier with the larger screen. The apple pencil is also really nice.
Tips - I don't like putting a bunch of other apps on the ipad I'm using for music. I don't want notifications or battery drain or instability from anything else while I am trying to play a concert. Airplane mode and then re-enable bluetooth so you don't have any wifi or cellular connection but you do have bluetooth connected for the pedal. I also turn off automatic updates. Forscore is great but it has had a number of bugs over the years which have been showstoppers. You don't want it updating right before a concert and either changing the behavior or introducing a new bug. Only update when you have a chance to test before you actually have to use it.
I used 3 or 4 different variants of the airturn pedal before I settled on the firefly pedal from pageflip. I like the feel of the pageflip pedal better and it seems to be more reliable about connecting to bluetooth.