This matches some of my thinking about services that I have considered using for my own projects. 30 days always seems to short of a time period to try and inte

This matches some of my thinking about services that I have considered using for my own projects. 30 days always seems to short of a time period to try and integrate something into my life. 60 or 90 days would seem like a better time frame to get a user hooked on your service. After 90 days they are either in love with your product, or not using it at all. So cutting them off from free at that point would be a reasonable choice IMHO. If they choose to pay right away, they can have full support. if they are not paying, they can use the community support. It has worked for OSCommerce, Magento, SugarCRM and a whole long list of others.