i know UK is Milltek country, but try to meet up with a forum member having the APR and take a ride, best get it on a lift and see for yourself the quality of, the compare to Milltek and then make your decision.
i would say in this case, you get what you pay for
Been down the Milltek and APR road with exhausts. The APR quality and tech involved is superb IMO with a superb noise when you want and not at all boomy in the cabin.
I suspect you maybe able to strike up a deal with Awesome on a deal for the MK6 item because I suspect you maybe one of the first MK6's with their system. Give a test in the first instance you'll be impressed!
Mine was on an Edition 30 with stage 2 mapping and I loved every minute as did the missus.