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I started using ISDX in ‘96 soon after PTC acquired it and managed to port it and make it work with Pro/E. I’ve worked on a number of products which are still in production using it, but it’s been a while since I was using Pro/E (now Creo). I don’t miss Creo, but I do miss ISDX. There was a while when I was using Solidworks and Pro/E (with ISDX) depending on the project/client, but then I transitioned to Solidworks for many years. Now I’m using Onshape (started by the key people from Solidworks) which recently was acquired by PTC. Both Solidworks and Onshape use the Parasolid kernel which was first developed for Unigraphics. It seems like it’s a small world in CAD tool development.