I get typically three questions, I want to provide answers on:
a) Why Azure – how does it make my life easier?
Here is the answer http://msdn.microsoft.com/de-de/ff728566(en-us).aspx
b) What is the expected performance?
Here are a set of benchmarks that help you estimate the performance of the infrastructure provided by azure
c) What is the data transfer to and from my computer and Azure?
Microsoft Research has released a throughput analyser that shows you the upload/download performance