Change is good
I have the Guardian Upright, I wonder if they will eventually be changing the entire line up of machines. The Aerus works great, however for the price I would expect them to have more features such as variable suction and be much quieter. Hopefully this new model will be an improvement, but its not on the website yet.
Aerus seems to not put much effort into the design and options in their vacuums; and the dealers who sell them love to rip you off. I think Miele makes a superior product with many features for the money.... they are very quiet. Also, there are more Miele dealers than Aerus in most parts of the country, so parts/supplies are easier to get.