Having owned an Airstream, I can tell you with all due respect the posts from DutchmenSport and Trackrig are not accurate.
1. They are incredibility easy to keep clean- the clear coat finish requires no polishing and road dirt blends into the grey aluminium colr, so it really is not very noticeable. Unlike all other RVs, you will never have black steaks that are difficult to remove. NO POLISHING NEEDED OR REQUIRED.
2. The rounded corners does eat into some storage space, but the very efficient use of all available interior volume more than compensates for that loss. Example, under the sofa is a "blanket drawer" that has enough space to store volumes of stuff.