We have all Dell systems here - including three laptops and to be fair they have all proven to be very reliable.
We do have service contracts on all the desktops, and the only thing I find a bit irritating is that on the two occasions we have had a problem, I end up taking the machine apart before they will come out to see us - but once they know what the fault really is they are excellent!
We have always purchased Dell computers with no problems ever. The laptops have been first class. But I ALWAYS recommend buying the gold 3 year service replacement plans. They are the best. If ANYTHING happens you get instant service or replacement. Just great.
I think Dell is the best maker of PC. We can customize our own Dell computer on the dell website for a good price. Their customer service is excellent. Before each dell computer is sold they test each and every computer for 100 hours to make sure that everything works fine, if there is a problem they will remanufacture our computer and test that one to make sure that it works fine.