I've been anxiously awaiting my Brompton since early March, so on occasion I have borrowed the shop's demo model, which is similarly spec'd to mine. This is a M6L-X in British Racing Green with the Shimano generator hub and Brooks B-17 saddle. Mine will come in black with the Schmidt Son generator hub. Every time I take it out, I have to tell myself: "It's only a demo, it's only a demo."
Seen here with the IT Chair installed. I have since installed a Bontrager Eco saddle in brown. I rigged a 6mm seatpost QR lever on standard straight post saddle hardware so I can flip the IT Chair saddle out of the way, so as to keep my Carradice City Folder installed on the carrier block. Did I mention I have a Carradice City Folder? Mine was made by a certain Priscilla. Thanks, Priscilla.
Here's the Brompton folded with the IT Chair and Carradice.
So far, I've taken this setup on a handful of commutes and family rides with my almost-five-year-old daughter. She's quite tall for her age, and still fits comfortably. I've wheeled it right in to the grocery store and used it as my shopping cart. I absolutely love it. Can't wait for mine to arrive! (Although I'll have to).