I have had 2 computers built by them, brillaint customer service, no problems at all, i went with intel myself, at the time seemed to be the best option, you do pay a bit more having a company build the Pc for you.
As this was my first time, i was willing to pay the extra to have a company build it for me, knowing that if i did have a problem, they would collect it and repair it for me. Now i would quite happy be able to build my own, its not that hard at all, and it would be a bit cheaper, but Yes overall i would recomend Pc specialist