Personally I wouldnt touch it with barge pole. Your pc is covered for the first year against hardware faults anyway. Software problems and theres usually the fix on the manufacturers sites, and for any problems like crashing the thing and not being able to get it back up, then the man down the road is often a lot quicker and doesnt cost an arm and leg in premium rate phone calls.
The last machine I bought in a shop with cover spent more time down and away being fixed then actually up and running. Every return took 3 weeks. In the end I rejected it (and the cover) got one built and when worse came to worse (once) cost £70 to fix and was back with 24 hrs