I own three SportClassics. Here's my story:
-2006 Sport 1000- purchased March '06 - tank bulged, dimpled, and spread in summer '08 - out of warranty, not replaced yet.
-2006 Sport 1000- purchased November '06- tank bulged and spread in spring of '08 - replaced under warranty October '08.
- 2008 Sport 1000S - purchased November '08 - no issues yet.
Sport 1000 #1 has 14,000 miles on the clock. The other two are still relatively low mileage. I'm hoping for a long range fix as I intend to ride them all for many years to come.