IMO, UV filters are only good for protecting the lens from physical damage. If you buy a quality lens to begin with and you take care of it, you don't really need it to add additional protection from UV. It's still good to have. A lot of the people I know agree that they'd rather break a $40 filter than a $900 lens. Coupled with a good quality lens hood, its a small investment to keep your lens from being damaged. If you have a cheap lens that yellows easily, why bother. As far as image quality, it makes no difference and may even make it worst if you buy a cheap UV filter.
As far as destroying the sensor, that's highly unlikely. Your lens is essentially a UV filter and very little UV actually makes it to the sensor. It's not sensitive to UV. You're also talking shutter speeds of fractions of a second in bright daylight conditions.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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