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I thought they guarantee to provide a certain level of service, such as CPU percentage, regardless of your neighbors.

If they guarantee X performance but all along they were providing 2X and now they're only providing X, customers will complain. There are different ways to configure Xen so it's not clear exactly what Amazon is doing.

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[...] so it's not clear exactly what Amazon is doing.

Shouldn't Amazon be providing customers with reports to this effect? It can't be that difficult to say that within each 10-minute interval i you got X_i% of a CPU, received N_i packets, etc.

This is the sort of data Amazon should collect themselves to analyze the systems within the cloud, so the customer never (OK, rarely) sees a problem.

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