That's a mighty interesting opinion, wrong though it is.
As the current owner of 2 Condors and one Eagle and having just sold a Condor I can only conclude that you are using inappropriate pellets, have a badly adjusted gun or are echoing incorrect internet opinions.
I can assure you that my personal professional experience of over 20 DU-10s is that a correctly adjusted one which isn't knackered will reliably feed six shots with the correct ammunition, some manage seven with short pellets,
Regards,
Nick