Actually I am neutral regarding the Lenale fan, only because I like the simplicity of not having one. I do design work and deal with equipment that is conduction cooled (heatsinking) and opt for alternate cooling methods that require no moving parts...because fans are INHERENTLY unreliable. You have all seen fan failures on commercial equipment...practically every PC that has been running 24/7 will develop noise in about 3 years, failure in 5 years in an office environoment.
Now consider military grade or rugged industrial grade equipment in the middle of the Arabian desert 150 deg F or 65 deg C bouncing around in the back of a HumVee in sandstorms and then rains...add routine maintenance, solvent/soapy water sprays used to clean all the equipment off. Add the application environment, such as roadside bombs exploding, machine gun fire etc., fan spinning at 3800 RPM that must be able to run 24/7 in all climates and conditions. You now know why MIL fans cost about $900 on up, EACH and why a $400 fan probably won't cut it bolted to a vibrating V-twin.