After reading some of the posts on these forums about festerblight, I decided to try it out. I really like the play style, and tried it out. I did significantly more damage then I did with the defile/PL build, however I have some questions about it.
Here is my profile.
http://us.battle.net/wow/en/character/korgath/Abdulalhazr/simple
Here is a sample log.
https://www.warcraftlogs.com/reports/kYm4FvqrGhgaxc1J#type=damage-done&fight=13&source=9
A couple of notes before you look at the log.
My usage of soul reaper has always been aweful, however now that I can no longer u