Rainer is working, and quite busy for the next 2 months.
But let me tell his thoughts about the "nodal point" issue, if allowed: as long as you don´t shoot subjects closer to a few meters (4 - 5 meters) the nodal point not being in the rotation axes is not an issue and can be disregarded and has no influence on the image.
Rainer has said this already, including in this thread.
And yes, the arTec does offer more movement possibilities, in fact it offers ALL movements: H & V shifts, Tilt & Swing, Rotation, Sliding Adapter, etc ..., all in one camera.
Wow, there are a lot of comments on what *else* to buy, but no feedback on the arTec, as requested? Where is Rainer when you need him?