ozzroo
yeah, i was pretty happy with $3000 to upgrade to a 4 panel alum bifold.
We paid not much more for a 4-panel timber bifold, staining and all. We also have a taller-than-standard 3-panel timber bifold, and added a pair of timber/glass hinged doors to another room, and altogether we spent $10000. They look fantastic.
Maintenance? Pfft. Who cares?
I really like the look of aluminium on some houses - depends on the house style and your furniture though. Timber suited us.