Well
I've seen a couple of videos of users that I trust. To test airflow of the new SRX PN, the turned the machine on HIGH speed, brush roll OFF, went over colored sand on a hard floor and the SRX PN moved no sand. They grabbed a couple of other PN's from other vacuums (neither was designed for hard floor cleaning) and ran it over the sand and it picked the sand straight up. Obvious the SRX is able to pick up dirt on carpet using the PN, because I've seen videos of people using it and the basin was gross as you would expect after vacuuming dirty carpet....so it IS doing something. It's just weird why it would have such LOW airflow at the PN head. I guess the agitation is doing most of the work.
I've done this very thing with my gold 2 speed PN2 and it does pick up sand on a hard floor with no problem, though I never use the PN on hard floors. So my Gold 2 speed's PN can pick up sand from a hard floor but the SRX PN's can't?
I love rainbow vacuums. I would never give mine up...My favorite models are the Gold/Silver/Black