Mine showed up today.
Well I put a clean paper bag and then swapped to the hepa bags. The cloth bag and pre motor filter were washed last week and the vacuum has been used 4-5 times since then so the cloth bag should still be very clean.
CFM ratings (machine body)
Paper: 5079 FPM or 132.56 CFM
Hepa: 5236 FPM or 136.65 CFM
Now that's not a significant difference. I am going to stick to the hepa bags though as they generally lose less power as they fill and they will keep my cloth bag cleaner than the paper ones.