On my second Airflex, only changed as one with a bigger pump came available at a good price. Have changed vac brushes on both machines, once on my first machine as as they were getting low after 2 years. And on the second machine , one vac packed up at a customers house, had a spare set of brushes in the van, changed them in 15 mins, back up and running, job done. So basically they are dead easy to work on and repair. But, they are the only machines I have worked on so can't compare to other makes and models.