I have had my triple vac Airflex for about 10 months now, compared to my old Ninja it is very well designed for ease of access to pump and vac motors, i looked inside the Ninja just once and thought better of it ! the Airflex is brilliant for access.
I had one vacuum motor go which was my fault for letting water get into the vacs, i am pretty sure it is on a par with the Scorpian for performance but out of the two i think the Airflex looks better, i would not hesitate to buy another, in fact i am looking at buying another so i have a spare for emergences although even when the vac motor went i still had enough power to finish the job.