ibm deathstars i presume
all the hardware in that box looks to be fine but either i'm blind or that pc world site mentions nothing about (in my opinion) the most important part of the pc... the monitor... you could be sitting in front of a superconputer and still have a miserable experience if the monitor is too small/has a crap refresh rate/isnt very clear... go into the shop and inspect it thoroughly... find out response times and stuff
these things also frequently come laiden with irritating and useless software that serves only to slow down your pc... remove it, you will probably never use it
the other thing with these kind of pcs is upgrading them... i assume you are not a geek (like me) so you wont want to have 3 hard drives and other miscellaneous pci cards in there... but if you do wanna do that kind of stuff dont buy one of these, the cases are too small and motherboards usually only have a couple of free slots if any