Of course I loved it, was there any doubt?  One thing I really dig about it is how both J.R.R. and Christopher treat the subject matter in an academic way, as if discovering ancient writings and treating discrepancies and gaps as different traditions of legend.  It's really cool.  The only criticisms I have are that Christopher is not as good a writer as his father, and his tendency to through all the footnotes into a list at the end of an entry makes it difficult to read, meaning that you have to constantly flip back and forth.  Other than that, it rules, naturally.