Please note: The Express tube and the SPS are NOT the same. The Express package uses the delta-shaped engine pod from the 2 tube hull and the middle tube runs forward from the pod to the bow of the boat. The SPS package uses a full length center tube that also serves as the transom and fuel tank carrier. The tube mounted tank is advantageous because the center of gravity is lower on the boat.
I've had both and the SPS is far superior. Also, as an FYI, the twin elliptical hull sits a lot higher in (on) the water due to the increased buoyancy. Thosewho need to clear bridges will want to make note.