I work for Boeing and all their computers are dell, in 15 yrs I have never had an issue with any computer I have used at work.
The same cannot be said for the ones I buy for home use. I have had many issues but the one that really makes my blood boil is my kids laptops, I purchased two basic laptops last december for the girls, they appeared to work fine for about a month. My eldest kids keeps getting battery errors, wrong battery, battery will not charge etc, still works just fine when plugged in. Now she cannot get into the web browser as she gets a NULL error. Not too worried there, less internet is actually a good thing.
My other kids computer completely died after four months, I just got around to sending it back and Dell is telling me that it needs a new mother board, which they also tell me is not covered under the limited warrenty and if I want them to fix it, will cost $498 +tax, the thing new was less than 600, I am done with dell, that fact that the mother board is not covered is for me the last straw, they will not get another penny from me.