I've had the Marquis for a couple weeks now and here's a couple things I've found:
The positive post and ground screws make for a solid connection with Ni200, but wicking is hard to thread with a typical vertical without deforming the coils. I built a dual chimney coil with 30ga Ni200 and it worked very well once I sorted out the wicking.
This one just hit me tonight: When built for single coil, you can orient the top cap so that you have two airholes pointed at one coil. Instead of using the middle hole on the cap for a single, you can rotate it so that the opposite hole (in dual mode) in the cap lines up with the airhole going to the back of coil and the other airhole will hit the side of your coil.
I apologize if I'm not explaining it clearly, but play with it and you'll figure it out. It gives you big airflow and I didn't notice a drop in flavor.
Here's the chimney build: