My general experience with Dell is that they build some quality computers at a good price. You really get a decent computer for what you pay for and that's all I would ask for from a computer company. Their support is really good compared to other companies. Though I got in on one of the 4500 back in August(10-17th). I have to say that it the only thing I have not been happy with.
The 4500's were fine, a little slow, but that was fixed after adding some RAM, the problem was that it was an online order and it didn't seem to go through. So I called up Dell and they told me that I could order them over the phone for the same exact price shipped. It was great since it even came out to be a little cheaper for some reason. I received the two computers I ordered over the phone promptly and they worked fine. Whisper quiet like everyone else says. Then all of the sudden, 2 or 3 days later, the two 4500's I ordered online showed up. I called Dell up and of course they offered to sell the computers to be for a discounted price but I refused since money was a little tight at the moment.
Dell had their carriers come pick them up with no problems then that's when I was calling up Dell almost every other day asking when I would get the credit for the systems. For some reason, when they ship things back to Dell, they don't seem to ship them together, or at the same time. The first few times I called up, they weren't able to find anything that was returned. They had the info that they were picked up, but that's about it. This is about 2-3 weeks after they were picked up.
A week later, I'm still calling and they tell me that they got the monitors and the speakers. They'll credit me for those for now, but it'll take 7-10 business days. Now they are still waiting on the systems for some reason. So far, I've recieved $400 of the $1400 credit they owe. Fast forward to today, October 7th, I am still waiting on $1000 of credit to be put back to my credit card. Today should be the final day that I'll have to wait since they tell me all the authorizations have been passed and whatnot and I can finally get my money back.
All in all, it has been a huge hassle that I wish I never had to deal with. Though I have to say that the Dell reps have been extrememely courteous with me throughout the whole process.