Passed this exam this morning. Was a nice change from the Cisco and Linux track I was recently on. I used the FastTrack program that Juniper is offering to get a 50% discount voucher and study materials for the exam. I have to say that the study materials that FastTrack provides will give you a good foundation if you have never worked with Juniper before, but aren't really enough to pass the exam. I think that the Routing Policies and Firewall Filters topics are really confusing if you have never worked with Juniper before and may take a few reads + additional materials in order to be able to understand correctly. All in all I thought that the exam was fair and with almost zero surprises.
Next up is the JNCIS-SEC exam.