I've had mixed experience with Dell support. I've had great ones (where the dude shows up promptly the next day with the right parts and fixes the problem in minutes) and horror stories (caught the repair guy prying hard at a notebook mainboard with a screwdriver and breaking the case 'cause he missed a screw, then sending the wrong parts to fix it. twice.) I suppose it all depends on who they contract with for support in your area and how competent their people are. I've had more good experiences than bad.
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~ John