What Dave 84 says. I had a Milltek years ago on a Vag and it feel apart inside. On a more positive note Milltek sorted it asap and sorted postage each way and sent a new system and a courier a few days later to get the old one- this was via AwesomeGTI. I had heard on some sites they know they are prone to failure and thats why they are so good and easy to deal with.
Personally I think the Milltek isn't that nice looking but a local fella has a full Toda system inc manifold and it is a lovely sounding system.