My wife and I recently started using this app and I love it. It's a great way to track our scores and what machines we have played in the wild. I would really like to see more features in the future.
Achievements, for example, would be neat. Think like the "Untappd" app for craft beer. It awards little badges for things like drinking so many of a different style or going to different types of venues. Imagine a badge for playing so many Superpins, or JJP pins, or games designed by John Trudeau (well, maybe not John Trudeau, but you know what I mean). Badges for playing EMs, System 11s, and WPCs. Badges for playing in venues classified as barcades, laundromats, pizza parlors, etc. I think it would add a lot more incentive for people to get out to different venues and play new machines and would add to the overall enjoyment (and growth) of the app.