Late-run book is actually very useful. It reprints almost every droid from all previous books, plus many more. Includes background on Droids in society, laws concerning droids, and of course, stats for the droids. If you have droid characters, or someone who wants to use droids, this is the book you really need to suppliment what little is in the core rules. Each entry also has "performance reviews" from the intergalactic computer holographic bulletin board system with suggestions and munchkin ideas that are pretty fun(ny). Essential? have to say Yes Usefullness? Extremely Availability? yes, but probablly expensive Liabilities: only includes droids from classic trilogy onwards--no prequel droid info. Many of the droids are from other materials, but at least this time they're handy in one place D20 conversion: Most of these have probablly already been converted by the new books anyway, but the background information might still be useful.