I didn't 'meet' any, but I saw a lot. Like people were on benches next to me, groups of guys sat down near me and were clearly flicking Pokeballs on their screen.
That Osprey thing works now, I took it into the EE store and they sorted it, Rowley - it's amazing!
Gonna go into work early again tomorrow in order to catch more, gonna be so gains!!
Meadowhall has plenty of parking, and then you can just catch one of the 700 busses and/or the tram to take you to the city centre. (£4.30 for a day pass for all busses/trams)