As another XSI user, I'm testing out Houdini. For me, the procedural modelling tools are very vexing, and I really like the nodegraph already. Curves in XSI are not very strong, and hoping Houdini could be something in between something like Fusion360 and XSI for me. It has PolyBevel on curves for a start
One thing about that function: The radius seems dependent on the angles between neighbouring segments - not maintaining circularity on sharp angles?
In Houdini:
In Rhino:
Thanks!