I bought a used 2006 in 2009 and have put close to 26,000 miles on it. According to the current market I can get nearly what I paid for it. I get the same mileage towing this one as I did pulling my white box hybrid even though the Airstream is 5 feet longer and a ton heavier. It pulls like a dream.
It is much better made than the Starcraft I owned. All trailers will leak if you don't take care of them. Most of the rotting floor stories you hear relate to trailers 20 years or older.
These are certainly not for everyone. They are small by comparison and have little exterior storage space. Of you want a home on wheels an Airstream is probably not for you. I plan on keeping mine for a few more years and then sell it for close to what I paid. We are happy with ours and never felt a need for a fireplace or a kitchen island.