I'll have a review up later today, but this is very true. Most people just look at horse power and while that does tell some of the story, air volume plays a huge roll. When I saw first saw it I was excited about it. I received it in the mail, unboxed it and wasn't really impressed. Then I started using it and seeing how effective it is as a tool, and how efficient it has made me as a detailer.
I'm very impressed by this tool. Honestly, the technology isn't game changing, but the execution of the idea is great! It solves a simple problem, and does it really well.