I have bought a few Milltek systems in the past - I have to agree with the comments about quality.
I had a full system on my Fiesta Zetec S which included a 4-2-1 manifold - I had that for 3 years with no real issues, however the stainless was starting to give up and start rusting.
The second system I had for 3 years on an Ibiza Cupra 1.8T - the weld on the pipe failed causing the pipe to fall into the center silencer. Milltek's response was that the welds weren't stainless, and not covered by the warranty! so ended up having to buy a new center section.
On my current 2.5TDi I used a local exhaust fabricator - what can I say, the quality is much better than Milltek - and its obvious.
Over a year later and it still looks new - perfect fit, no rattles. Cost much less than a Milltek too!