I know, I know that it is a lot easier and less expensive to have a bagless vacuum. All you have to do is take the cup out, empty the dirt, and put the cup back in. But dust will fly if one is not careful.
I feel that it is better to contain the dirt in a bag. Windsor vacuum cleaners have a paper bag while Miele has a cloth-like bag. If there are pets in the house, put a flea collar in the bag. While vacuuming, flea eggs will get picked up and killed in the bag. With these vacuums no dirt will be left behind!