We get a few dells and they all are pretty good. Since ours are for moblity and business, I can only comment on their Laptops however. From a business sense, they are really good, reliable, and I like how each has options in how you make them.
However, I've heard from those that don't get new comps for the their businesses often, that these computers are a nightmare to upgrade, and that their desktops are not as good as the laptops and have a tendency to die rapidly. In otherwords I've HEARD not experienced, that their desktops are really bad. However, their laptops and Dell seem great for what I've handled in regards to business for laptops.