It was my first time shooting the positive paper and I have to admit it was quite straight forward despite the fact that it was also my first time with the 4x5 format in a pinhole camera. It is a very nice experience but, depending on the camera, you can have back not very nice results.
The paper is a very high contrast film, so be adviced that if you use a pinhole camera, you maybe want to use a short focal lenght camera to minimize the vignetting as well.
Pre-flashing the paper helps but it takes a bit of practice.
Also, beign a fibre based paper, it curls considerably. To minimise this you can let it dry on the wall (tiled wall) and/or you can iron it at the end, when is completely dry.
I think it is a very nice way of experimentation