I have run a cleaning business for 30 years, and I have also worked in janitorial for various cleaning companies. I have spent countless hours fixing, unclogging, and cleaning vacuums of various types and brands. Although I have never tried the Dyson vacuum, I have found the other various bagless vacuums to be miserable failures. Many of them work well but in my opinion, there are so many filters that must be either cleaned or replaced, maintenance is a constant and time consuming issue. Ordinary bagless vacuums are a bad idea.
When I look for a vacuum, I want one that if there is a clog, I can fix it myself, and that replacement parts (such as a hose) are not expensive. I also have found that the fewer bells and whistles it has, the fewer things are likely to break and the less it costs. I understand the problem with vacuums where you must buy bags, and how suction reduces as the bag fills. However, this is less a problem to me than a vacuum that requires constant maintenance.
I like this brand and this model. It’s straight forward, with no bells and whistles. I have had mine for 18 months, and it works great. I can purchase hepa filter bags too. The one thing I don’t like about it is that if you want to use the hose attachment, the beater bar continues to run (just like many models), so I must be careful. Here’s the link: http://www.vcdiscounter.com/mcug383.html