Think if it as an alternate user interface to the program, the program remains the same. The "c" stands for connected, it runs in a web browser but it is not a web SaaS product - people often jump to that conclusion.

As all markets, beginning with media and software, switch to this "As a service" model, we should no longer think of it as something being delivered over the web. If you buy a car as a service, it stops working if you stop paying. Likewise with subscription based software. This is the new model. As an incentive to move customers to this model, which will become the only model, Sage is offering certain new features that will only be unlocked for the 100c customers. Otherwise, it's the same product living wherever you installed it.

You can buy a car as a service?

Wait my car will stop running if I stop paying on my lease?

Scary thought....