I tried the bagless "PET" version for two years and it was dusty, difficult to empty and bulky to use. The cord ALWAYS got in the way, and no matter how I tried to vacuum clean, I was always disappointed. THIS machine (S20EZM) shows that they have solved those problems and I like them. Same performance, cleanability as other Simplicity products, but exactly what I expect from a PET and emptying the unit isn't a mess.