GE has a jet engine commercial that airs every Sunday morning toward the end of the "Meet The Press". It has a big jet engine strapped to the top of the Wright Bros. plane. I am so reminded of that commercial by that HSF. At least you get to hearJohnny Cash singing in the commercial.
I think it looks really really cool....but I wouldnt use it on a case unless it was some sort of retro looking mod (Like the Metropolis movie mod I have planned) or even to hack it up and use on other areas of the case. Would look cool as intake fans if you actualy made a case with wings and aeronautical stuff.
Shown below are the official specifications of the Jet 7, as listed on the packaging.
Intel PIII up to 1.3GHz
Intel Celeron up to 1.4GHz
AMD Duron up to 1.3GHz
AMD Athlon XP up to 3200+ and higher
Socket Type: Socket A, 370, 462
Dimension (H/S) 74x60x40mm
Fan Dimension: Blower 80x80x80mm
Fan Speed: 1900-3500rpm
Fan Airflow: 19.89-22.10 CFM Fan Noise: 25.1-40.4 dBA
Voltage Rating: 5.0-13.8 V
Also using the unit, it does not seem any louder (at low levels) than the Coolermaster Quad LED fans which are rated at 25dba.
The ratings you have linked may be 'actual' readings using a 'in house' decibal tester. Those will always have higher dba ratings than standard manufacturer tests.