Was wondering if any of you are running the new auto case feeder on your 550b? Want to hear if it works well or is finicky. Was it worth the $250 or so they ask for it or would I be better off with a 650 with a case feeder? I've had my 550 for over 20 years and the prospect of upgrading it with a case feeder is attractive as long as its not more trouble than its worth... Thanks!