You make it sound like the loom is a bit scabby Phil - it's just that the cruise loom is not available as a part, so I have no choice but to make one!
Wire sizes are all to correct spec, as are the connectors (which are always soldered, as opposed to press fitted, so are actually better than factory!).
Let's put it this way - I've only ever had one warranty failure, and that was due to a faulty stalk from Audi, which only materialised about 18 months in!
Cheers,
Mike