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I recently moved into a house w/a basement. It's the first time I've ever had a basement. One of the best things to me is the easy access to plumbing and HVAC systems. If something goes wrong, or you want to replace/improve them, it's all right there as opposed to being in a cramped crawlspace or insulation covered attic space.
mdp mentioned the heating/cooling benefits. They are real; being halfway in the ground really prevents the space from getting too warm or too cool.
The biggest negative: radon gas can build up. This is especially a problem in the mountains and foothills of our state. There are tests and ventilation systems available.