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it is much easier to level as shadow spec, esspecially level 40+. You can still heal quite well as a shadow priest.
So true. I've read the FAQ's on here and they are really general (The pally forum here is really good though....) so please feel free to post questions!
I have a lvl 61 shadow priest (putting the majority of your talents into a tree basically makes you that spec). Since hitting lvl 60 and moving to Outlands I have a second set of gear for healing, but still have an easy time healing. When you are playing solo though, it is so much easier to dps (damage per second) when you are shadow spec. Most people I talk to say that if you are going to go Holy, wait till lvl 70, get some gear and then convert.
Have fun!