About 60%-65%.
It drops by 5%-10% at the hairline.

I haven't bought from Toplace yet, but where ever I buy from, I usually by stock pieces so I wind up getting a pretty average density.
White/grey hairs are starting to really infiltrate my natural hair, so I'm going to have to start ordering custom pieces soon, which is a pain.
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@ Gojja

This is how the hairline starts out when I first get a piece.
The hairs are going in random directions.
Taming them allows you to style the hair more how you want.
You could try doing the comb/water/hairdryer thing with the system off your head and pinned to a styrofoam head if it was easier.