For me it’s been a drop in replacement, it feels very similar. I don’t use all the features. It has LISP scripting support and a lot of the recent updates have been dealing w/ BIM. I do a lot of 2d drafting with the occasional 3d drawing to have something machined or printed.

ares commander. It’s cross platform and relatively inexpensive. They ship .rpm .deb and tarballs.

I recently read the Samson Option. Pretty wild how the world just let Israel develop the bomb.