Transferred 140,000 Starpoints last time this offer ran and used it for two First Class tickets to Europe this summer. We are traveling on Swiss and the entire transaction could not have been easier.
Just used their 100% bonus for transferring US Air miles to my spouse and am using the 50% bonus to top off so we each have 100,000 miles in the bank.
BTW, I asked these questions when I did it last year and the only issue at the time was, "will US Air still be in business?" Guess it worked out!