Not sure any other book is a better source for information on Jadidism. Khalid's focus on the 'spirit' of Jadidism - how they viewed the world around them, and how the world saw them - gives the reader a good idea of what they fought for.
The Jadids were incredibly progressive for their time, and most of the values they held are shared by us in the West in the modern day. They viewed the proper treatment of women as equal to men, called for education for everyone, and saw the groups that were doing better than them (such as Jews and Armenians) under the same circumstances as simply more knowledgeable (instead of enemies), advocating for their own people to see them as examples for self-improvement.
To me, that's proof that the Muslim world is not incompatible with civil society. Unfortunately it faces many of the setbacks Jadids saw back then (exploitation and downright bullying by bigger nations, getting pushed back on their advancements by traditionalists, etc) but the spirit of Islam is progress, and I'm confident we'll see the religion advance with the times.
Rated it 4/5 stars because the formatting on the book is a little confusing, though I only read one edition of it. Some paragraphs are incredibly long and break the reading flow.