I've read through a bunch of topics here on the forums, including the FAQ, but I haven't seen a topic dedicated to this concept including heirloom items.
Right now my rogue is 35 (almost 36), and combat. Thanks to my main's raiding and having nothing to spend emblems on, I have both types of heirloom daggers, the emblem sword, and the shadowcraft shoulders. I am somewhat lazily saving up emblems now for the Hand of Justice trinket and the PvP Thrash Blade sword.
I know combat is the way to go until Mutilate becomes viable. I know I somewhat shot myself in the foot by buying the PvP dagger instead of the PvP sword, since now both sword spec or close quarters combat are fairly useless. But, that's how it went, and I'm still leveling quick.
Now, at level 50 I can go Mutilate. But I don't know if this is a good leveling spec or not. There are pros and cons, which I will list, but I'm wondering if anyone has experience leveling a rogue with heirloom items and which spec they found better. I'm bored at work, so there's my reasoning for asking :-P
Combat: 75% offhand damage instead of 50%
5% increased chance to hit
2.5% decreased chance to be parried/dodged
Faster energy regeneration
Decreased Sprint cooldown
Mutilate: 15% movement speed increase
5% crit rate
110 max energy instead of 100.
Stronger poisons (20% increase)
Faster combo point generation
Increased energy regeneration (but less than Combat)
Mutilate (stronger damage, more combo points than SS)
They're two very different styles. While mutilate really appeals to me, especially with the 15% increased speed, I think losing the 10+% damage I'd get from Precision/Combat Expertise might offset it. However, the middle row of Combat has been VERY lackluster; I find myself "wasting" points because I can't really use sword spec/cqc, so I'm just tossing points until I can hit the energy regen/damage increasers in the highest tiers.
So, advice? Anecdotes? Your own leveling experiences? Inquiring minds want to know!