I remember looking at it 12 years ago or so, for embedded applications. For some reason I decided to go with ISLISP instead, though I no longer remember why.
its features are comparable to old Lisps from the 70's, prior to Scheme and Common Lisp. Nothing really new here at all and lots of old bugs passing for features.
You are being downvoted, unfairly — that was probably the reason why I could not use it back then. And just to clarify, because these discussions often get sidetracked: the GPL is a problem in a commercial setting not because of the source availability requirement, but because of the anti-patent clause, which is basically a minefield.