I had a Dell desktop from the summer before my freshman year of college till the summer before senior year. I called tech support a few times while I had it, though I couldn't near the end since only about 1/4 of it was from Dell at that point

However, I was thoroughly impressed when, upon one instance in which they couldn't solve my problem over the phone, a technician came out to my dorm room, free of charge (under warranty).

Of course, I would have been more impressed if the problem had been solved

Come to think of it, I'll blame DNNA, though they're about 5 steps removed. I never did get that damn Diamond Viper card to work properly