seems kind of expensive for what it does.

imagine a game with 100k DAU (big, but not huge)

2 sessions per user per day

say 10 "saves" per session

100,000 * 2 * 10 = 2 million synchs / 10k * $0.15 = $30/day

for $900/month you could do FAR better just rolling your own

these numbers are all reasonable for a mobile game... so it seems to me that the main use pattern would be for apps that don't need to synch very often. and if an app doesn't synch very often, why even bother throwing an auth wall at your users?