[QUOTE=reuelt;1950029]Dust Deputy is not the best. They claim ONLY 99% - same level as what a $4 (Made in China) Cyclone claims.
"The award-winning design of the Dust Deputy cyclone uses centrifugal force to cyclonically separate and remove over 99% of dust and debris from the air-stream before it ever reaches your vacuum's filter, eliminating clogged filters and suction loss! "
A ClearVue Cyclone claims >99.9%
That's not actually their relevant claim on their current website. This was just taken from the ClearVue website
Separation of airborne dust is six times better than competing models. Independent medical school testing recorded separation rates at 99.9% of dust particles larger than 5-microns and 80% of fine dust particles sized to 0.5-microns. So little dust gets into the shop vacuum resulting in less filter cleaning or need for replacement filters. Continuous full airflow is uncompromised. The Mini CV06 is a great addition to any workshop. Used in conjunction with a shop vacuum, it is ideal for hand tool workstations and general dust clean up.
This is the claim from Oneida about their Dust Deputy
The Dust Deputy will separate out over 99.7% of nearly any type of dust and debris, with less than 1% making it into the vacuum – significantly extending the life of your vacuum and saving you countless time and money on expensive replacement filters and dust bags!
These claims do not allow head-to-head comparison (funny how competitive companies always manage to do that). ClearVue claims 99.9% of larger than 5-micron dust particles, but only 80% of fine dust down to .5 microns. Oneida, on the other hand, claims 99.7% of all dust. Which is better? No clue.
I agree that both of these marketing claims are just that: marketing claims. They may be based on scientific findings about their units, but a marketing claim should always be read with a healthy skepticism.