Three months back I purchased lucent general knowledge for ssc exams.i have almost read 60% of the book.the material in the book is easy to understand.the book is good.but I found some drawbacks in it.there are only notes in the book.a detailed study is not included in the book so that students can understand the topics properly .it can be helpful during revision.it couldn't make a base for general studies.another thing that I found problematic is the current affairs portion.an uptodate information is not given in the book.
You can read it.but don't study it for UPSC.it can be good for lower level exams.