Summary: Search on Google for "Del SP2309W buzzing noise". A lot of people, me included, had this monitor basically die not long after the warranty expired. Personally I think they're defective, I have LCD monitors years older that still work fine. I won't be buying any more Dell monitors, that's for sure.
Pros: This monitor has a very beautiful, sharp display and has an easy-to-use menu.
Cons: However, it buzzes intolerably if not set on 100% brightness. The first monitor I had (I've had 3) shuts off after an hour and the only way to get it to stay on is to reduce the brightness setting and put up with the loud buzz.