Using a laser particle counter Ive tested a Ridgid shop vac with a cyclone, a bag filter and their blue filter (next to best one sold for Ridgid vacs). The air coming out of the vacuum was cleaner than the ambient shop air. So, unless you are cutting seriously hazardous materials, save your money and don’t buy the overpriced vacs.
Im pretty sure they all use brushed motors so I would not expect the high priced vacs to last much longer than a Ridgid. Certainly not nearly as much longer compared to the price difference.
The Ridgid vac flows more air (unrestricted) than a Fein or Festool too.
Filters are much less expensive too but if you use a cyclone and a bag upstream you will never have to change the bag or the filter. I went tbrough a set of motor brushes on my Dewalt (around 600 hours of cutting) and my vac bag was still only about 1/4 full. The filter still looks new.