[lars-b2018]

I use Common Lisp daily on macOS and Linux, but use SBCL and Emacs with Sly. Never tried out a commercial implementation so I cannot compare to Emacs and SBCL. Are they worth the money vs. the open source tools?

[mark_l_watson]

I use LispWorks proprietary UI library CAPI, otherwise all of my code is portable.

SBCL and Emacs are great, use them often, also.

[tachyonbeam]

How could they be worth it? Vendor lock-in has a huge cost IMO. You're going to have to keep paying for these insanely expensive licenses for years, maybe decades?

[pjmlp]

If one wants to use Lisp as the Lisp Machines/Interlisp-D allowed for, only the commercial versions offer such experience.