They are much sought after we had a 2003 model which we bought in 2006 and liked it so much we kept it long after we would have normally traded up. We sold it in 2014 and got a very good price for it
The only negative I have come across with Baileys between 2005 and when the introduced their Alu-Tech system is that after 2005 they ceased using drilled pilot holes and used a screw with a needle point. This, according to my caravan service guy meant that a lot of strain was introduced to the panels and they had an increased tendency to split and allow water ingress.
He said he saw far more Baileys made after 2004/5 that had water ingress than those built before that date.
This was one of the reason why we hung onto ours for so long.