I had the misfortune of being given this computer to use by my company.Thankfully I did not have to buy it....
When it came new it worked like a charm, no complaints then, after 3-4 months use if found that the cursor kept on jumping, when I spoke to my technical dept to get it fixed they got on the job, it took Dell a week to send someone over just to tell me that there is a problem and perhaps requires a motherboard change - what the heck its under warranty so it got changed.
Once again worked ok, still had the cursor problem, a year or so later while working the computer crashed, and was dead. Once again Dell was called in, and it required yet another motherboard change, although we had an exclusive deal with Dell, and I got a temporary replacement, it still took many calls and mails to the highest level and six weeks later got the motherboard changed.
Thankfully, being in a new project meant that I had to return the laptop back, and got a new Latitude 6400, which i`m glad to say is way better than the 630 Latitude I had to deal with.
Dell needs to badly work on its customer relationship management, and after sales service. These days there is not much difference between products, the difference lies in the post sales service.