AWS's premium support - a model for good customer service

Nothing new here, but had jotted down notes from the Amazon all-hands over the summer that was focused on being customer-centric.  I was particularly struck by how AWS is offering premium support.  If a customer buys, premium support:

• There is no contract length they’re bound to.  They can terminate service anytime.
• There is no maximum number of contacts.  Ask away without being charged or hitting a limit.
• They get Trusted Advisor, which provides automated tools informing the customer how to optimize, improve security, and save money.  

I love the last part, where the tool actually recommends the customer descale or use cheaper options, which causes Amazon to earn less.  This is definitely the right thing for the customer, and builds long-term loyalty rather than short term gain.  Good stuff.