[bikamonki]

I am also doing research to select one such service and I believe the decision point comes down to this: pricing based on user count vs pricing based on activity (i.e. API calls). I think developers will chose the latter since you can somehow program you code to limit API calls but you cannot determine number of users in advance. So far Stormpath is winning b/c of this reason.

[pauleddie]

yeah I just seem to find number of API call to be more expressive to think about, but that might be because I'm a dev and think in that way. Also knowing I can easily buy more API calls enables me to make a nice graph of predicated costs which logically increases with number of users rather than having to jump up a tier of pricing.