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One little thing I did for Allegro was to compile their docs into a dash docset so you can use emacs' dash-docs with it.

Which is a pity because at least for LispWorks, the IDE itself and the CAPI GUI toolkit could be considered killer apps.

I've never used them myself, so in all honesty I have nothing to say about them! :p

That said, I support free software and I believe a proprietary compiler is not a good idea :(

The FOSS experience is a poor imitation of Lisp Machines.

Ideology aside, most proprietary compilers (mostly for Forth, Pascal and Lisp) I have used are of _excellent_ quality.

A lot also provide you the source code once you pay. AllegroCL is one of them I think.