I recently purchased a Cerberus with a number of small upgrades as it was important to me that it was quiet. I wasn't able to afford watercooling, but Damon was very helpful in balancing cost and noise reduction and responded promptly to my emails. The end result is an impressively quiet system - certainly quieter than my old Xbox 360.
Performance so far has been flawless - I am running Max Payne 3 on maximum settings using my 42" TV as a monitor (connected via HDMI which made set up very simple) and the frame rates are excellent.
Build quality looks good, and the machine is very nicely put together. Delivery was within the promised 10 working days, and I was kept up to date by email as the order went through.
Overall I am very impressed by the PC and the level of service provided by UKGC, and strongly recommend both.