This article is a good read on pricing: http://onstartups.com/tabid/3339/bid/37737/Secrets-Of-Freemium-Pricing-Make-The-Cheapskates-Pay.aspx http://onstartups.c

This article is a good read on pricing: http://onstartups.com/tabid/3339/bid/37737/Secrets-Of-Freemium-Pricing-Make-The-Cheapskates-Pay.aspx http://onstartups.com/tabid/3339/bid/37737/Secrets-Of-Freemi... Per-device pricing means your users need to make a pricing decision every time they add another device, which they may hate and try to avoid.