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I've thought about this in my own car and decided against doing it. Yes, you get better mileage and a bit better performance by eliminating the drag from an engaged clutch, but it has serious downsides as well.
If the electric fan dies it will die quickly owing to the failure style of most electronics (immediate crap out and off). If this should happen on a trip you are generally screwed (no replacement available, etc.), and there is a good chance that without a sensor to detect fan failure (and alert you) your radiator could overheat and explode (I'm thinking of failure on the highway here).
With a clutch driven fan these dangers are greatly minimized. Generally the clutch will fail slowly, wearing out over time and giving you good warning it needs to be replaced. Additionally, it could easily fail (and maybe always does depeneding on the design) in the engaged position, further reducing your risk by guaranteeing it draws in air, whether it works or not.
Most cars these days use electric fans, however, so that probably tells you something. Personal call in the end.
-rt
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