Finally took the exam this Monday morning just before voucher expires tomorrow end July. I took SANS 542 course in March.  My practice test scores were 79% and 86% respectively. First practice test was taken closed book, i.e. I did not refer to my course materials. Spent about 1:10 hours and passed with 94% 

To be honest, the exam was not difficult if you know HTML, JavaScript and SQL; i.e. you have programming background. Which I did due to past experience as database admin writing stored procedures and optimizing SQL queries; and as a web application developer writing server code and more importantly writing and troubleshooting client script code. There were questions about tools, which you can easily find the answers to from the course materials.
Overall SEC542 is a good course to get web developers trained on security. Don't think I can be a web penetration tester yet. Think I will try eWPT next.