Holy shit that is expensive. Though the decibel rating is not published, I assume that it will be rather loud, also, given the amount of airflow it tries to push (54 CFM) and the fan’s overall design. Even looking at the “expensive†computer fans, four could be easily gotten for the price of that one Stinger, and would seriously outperform it, certainly in terms of cooling capability and likely in noise output as well.
Compare:
Stinger SF3N -- $32
Dimensions: 8.125" x 1.75" x 1.75"
Max Air Flow: 54 CFM
Noise: Unlisted
Thermaltake A1280 -- $7
Dimensions: 120 x 120 x 25 mm (4.7†x 4.7†x 1â€)
Max Air Flow: 78 CFM
Noise: 34 dB
Thermaltake Thunderblade -- $7 (if you wanted to spice up the rack by adding blue LEDs)
Dimensions: 120 x 120 x 25 mm (4.7†x 4.7†x 1â€)
Max Air Flow: 78 CFM
Noise: 21 dB (granted, the fan is sleeve bearing, but I doubt it is quite that quiet, personally)
Kingwin F-012BB-4Pin -- $7.50
Dimensions: 120 x 120 x 25 mm (4.7†x 4.7†x 1â€)
Max Air Flow: 79 CFM
Noise: 30 dB
If you wanted a temperature sensing fan, those will likely be in the $10-15 range (I think I read that the Stinger had that feature? I do not remember, however…) So if you’re not absolutely set on the design/appearance of the Stinger fan, there are much smaller, better, and (I would wager) quieter performers for considerably less money.