Going back a bit, to answer the exotic aluminium question......my experience is
1.Too stiff with no flex and straight blades makes them very tiring and draining after a while compaired to curved steel
2.heavy at over 1kg
3.look a bit iffy on a retro ride imo.
Saying that ive ridden on them for 2 years with no issues, and as shop seconds ( small scratch) for £50 delivered cant complain
My plan is to swap for soma cr mo canti forks in 440mm. They are about £140, but if anything like their standard forks ive used a great ride. Ok they are still shade under 1kg, but its more about ride quality and style for my older frame.