pointless in a city centre.
yes there’ll be a dominant side (blue here iirc), but watch the map over 2 weeks, and it does change.
but it’s a massive timewaste, needs cooperation, and then some others will cooperate to undo everything you’ve just done.
it does make you see the town in a different way, and also play it for a week and you realise how many others fondling phones are also wasting time on it.
I got to L3 (edit: might have been L4) and deleted the app. What it really is, is a way for Google to get people walking round towns with wifi, gps and 3G enabled to populate Goggle’s location database 😉 Very clever though.