Cambridge LISP is okay as a LISP implementation, but the compiler isn't
exactly bug-free (nor is the interpreter, but it's useable). The
documentation is HORRIBLE, perhaps the worst I've seen for any Amiga
product. The support is available through Metacomco in England. The
development environment is not well implemented and Cambridge LISP is based
on PSL, an order LISP dialect that came out of the University of Utah.
For the money, XLISP isn't too bad (it's free).