The subscription model is one that potentially great relationships are built upon and these right into your revenue. It is critical to afford a great easily understood value to your customers, one they are willing to pay for.
The greatest challenge today is the true data and what it really means. Most SaaS companies simply stumble their way through the data and build services and revenue off what we think is right.
SaaS operations like Salesforce.com, Hubspot, and others have been around for years and they pretty much "get" as much information out of the data possible and are viewed as industry experts in it. However only a few hundred have made it to multiple $100s of millions in revenue and not many more if you include $100M in revenue.