I have one and LOVE IT!!!
I'm a little over 5' 11'' and I have the 20 inch model.
Also a Brooks B17 on it.
The front of my handle bars are about 2 inches above the seat
and the bottom is about even with the seat.
Seems to work out just right for me.
And when I want to stretch out I can ride the tops of the handlebar.
Although most of the time I'm in the bottom of the bars.
Several centuries and long days and its still super comfy.
Hope you enjoy it.!!!