Well it's been a good deal of years since I stocked parts and I am sure quality will have changed as the years have passed, so I wouldn't like to say. I am however impressed with the the new Numatic bags I've seen. For drive belts I often found that genuine was better, whereas with bags and filters it could be pot luck as some none genuine parts were very good, whilst others were poor. I was purchasing to satisfy a local market and buying the very best for cleaners. Certainly with hoses and attachments it was none genuine all the way for me, as people were not happy to pay the much larger price for genuine parts in this instance. Also, the margin on genuine accessories was poor as I had to price them to sell, whilst paying more for them to begin with.