Just got my security+ and wanted to share my experience.
First of all i was surprised by amount of performance-based questions. I was under impression that its going to be 3 of them, but i got 6 or 7. For a second i felt like they will never end!
I user Darril's book and Darril's questions/answers book too to prepare. Flash card were really helpful to see where you stand. Watched some of the Professor Messer's videos as well. Tried to take Practice Exam from ProProfs - thats no good - poorly worded questions and a lot of them are not similar with real exam.
Good advise would be to memorize port numbers, it will help you to answer fair amount of question.
Thank you, Darill Gibson! The book was a great help to organize information in my head, very structured.