I used Brian Kopps lvling guide and they are really good.

Not only from an XP point of view which is where they shine, they are also constructed to max your rep with each faction.

On a side note, alot of odd things like pets etc are also included as "optional" ie if you dont mind getting side tracked for 15-30 mins.

Never paid for em tho, but i would say they Brian Kopps would have been worth it.

From a mBox perspective i use questhelper, I get all quests and with 5 chars i just trash, no guide needed since they usually never include xping in instances and I prefere to lvl in instances.