I did a quick google and took a screenshot of the 1st pages that came up and it appears the Powr-flite is half price of the Dirt Dragon.
Also, i don't understand why you think the DD can get under cabnets better then the CAS16. The CAS16 is an entire inch shorter then the DD.
1. the powerflite has a much larger more powerful vacuum
2. it has a wider cleaning path
3. it's lighter weight
4. it's rated at 12,000 s/f an hour vs. the DD which is only rated at 10,000.
5. PF has a 4 gallon solution tank vs. the dd 3 gallon
6. PF has a 35 psi on-demand pump vs. the DD's POS gravity feed system.
the list goes on and on!
basically, the powr-flite CAS16 will do everything the DD can do and more! It's better, faster and half the price. Also, the CAS16 is a true multi-surface tool (wood, tile and grout, concrete, etc). The dd is not.
Here are the links to the spec sheets. Read them for yourself and you decide:
http://www.powr-flite.com/text/pdfs/SPEC SHEETS/Automatic Scrubbers/CAS16-spec.pdf
http://www.basiccoatings.com/Brochures_EN/E1000_B102/Dirt Dragon Brochure.pdf
.
powr-flite is half the price.