Just (last week) successfully used 6 CR-1s to upgrade 3 of us on a p.s. return trip in February - to me it's the e500's that are useless since mine no longer auto-convert and I fly relatively little domestic. I wouldn't have wanted to chance a 1K and 2 1Ps using e-500s for the SFO-JFK-SFO run, so from my perspective, keep 'em coming!