I have recently replaced 3 of my FLSing dies (well actually Redding Body dies, not true FLS dies) with Forster and must say I am mightily impressed with them.
As you have pointed out, the expander high up is very good as the last bit of the neck is still being supported in the sizing down section as the expander button begins it's work on the neck.
These dies produce zero runout. A lot of dies induce runout rather than remove it including expensive Whidden dies I purchased.
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