I know there's already a thread about roof bars http://www.upownersclub.co.uk/forum/roof-bars-pictures-added_topic1002_post12103.html?KW=roof+bars#12103, but there are quite a few makes available and I'm wondering if anyone has experience of different types of bar? Is there any advantage of aluminium aero bars over steel apart from the fact that they look good? I want them to carry my bike and I'm thinking of getting a complete Altera system as I like the look of the carrier. It looks very like what VW offer. Could it be the same?