I purchased this PC a few years ago and initially was extremely pleased with it. It was quite fast, had a large amount of space, had a built in CD/DVD writer, and an expansion bay just below incase anything else needed to be installed. A great thing about it is all of the USB slots, audio slots etc are all directly at the front of the PC. This is good because you don't need to reach to the side or the back like you do for some PC's. The negative is that as time has gone on, the PC has started working much less efficiently as it did before. It freezes often, often is very unresponsive, and even with a quad processor can be quite slow at times. The default graphics card is also quite weak, so if you like to play games you will most likely need to upgrade.
I got this PC after my old one exploded back in October 2007 and I paid £850 for it. After 4 years it is still running and all I've added to it is a 8800gt GPU and Windows 7, fitting the 8800gt was fun as there is'nt a lot of room in the case and I would RECOMMEND(!) a more powerful psu as the standard one can run it at 300w but you will get the odd BSOD10/10