I have to say, I haven't had a single one give me problems yet. All that I have purchased online and were shipped started eating F/T right away and without any fuss. Even though they were usually fed live at the breeders.
I think once they are established feeders and get set up correctly, it is a lot easier.
That's why I made sure that all the hatchlings I bred were completely and firmly established before re-homing them. That meant at least 2 sheds and 5 easy feedings. For some hatchlings that took longer then for others.