I definately prefer aero ports, with flared ends of course. I won't build another port without having it flared ever again. The problem is the guy i'll be building the box for wants 2 ports, one on each end. If it was up to me i would definately do a flared aero port. My tools are very limited so i'll be rounding out the port using a dremel, it just takes longer. I guess i'll make a design for an L port and split the internal port air space in two and have 2 slot ports or even 2 L ports. Had a box built for his friends' using an aero port and it worked out great, but hey, he wants what he wants.