This is what I want to know.
Assuming that its only a dps increase if you can use Feral Charge to get 2 Ravages in as otherwise you really only get 1 Ravage every 27 (glyphed) 30 (un) seconds which would be the same as just using Feral Charge and not having the 4 set bonus.
With Dragon Soul it would seem on a few fights where dps counts, Tendon on Spine, Ultraxion and Id assume the Limb on Madness you cant use Feral Charge, So that leaves 5 bosses, 4 if your not quick enough to get back in melee range on Warlord.
As well as most tier pieces having expertise or hit. To me just looking at the tier, It doesn't look like its worth it.
I'm sure that if you had a chance to take heroic tier over non-heroic items, you'd take it as its a 40agi upgrade minimum.

That's just some facts that have been sitting in my head which has been turning me off the 4 piece and would just like to know what other people think about it?
ATM my Rawr is playing up just not starting so I have to fix that up but I dont think Rawr takes into account that fact that you can't run out every 28 seconds to use Feral Charge, It's just numbers on a tank and spank fight.

And that's not to take into account that if you have your 4 piece, Depending on your raid set up, You might have to go into Bear and use Survival Instincts which would be a minimum of 15 second dps lose.
(Highly doubt that would happen unless your raid group has very minimum raid cd)

Looking at my logs from last night I can say that Nurturing Instinct has no effect (or an extremely small effect) on either the tics on yourself or the tics you give to the raid.

WOL search of mass regeneration during Ultraxion where I had Nurturing Instinct

[22:47:04.164] Xenoborg Frenzied Regeneration Xenoborg +10107
[22:47:04.295] Xenoborg Mass Regeneration Ruskó +2527

I had 256k (rounded) normal maximum health at the time, giving 332.8k during regen, with an expected healing tic of 9990. The actual value was 1.15% higher, but I believe this is due to a slight further increase in my health from a resto shaman. The mass regen tic was the expect 25% of the tick on me.

As an additional note, if you are using the 4pc raid cooldown as a cat, you should have it glyphed. The health and healing bonus will persist even if you immediately return to cat form. You also would likely not have the rage to power the unglyphed version anyway.

I don't see how rage can be an issue, as you have to spend 15 seconds in bear before you even cast Mass Regeneration on a raid.

I'm sure he means rage to sustain the HoT effect. Without a tank level damage income I doubt you'd be able to sustain the huge rage cost for the entire duration of the effect.

This actually never crossed my mind. Every time I use Berserk, I would spam Shred (while maintaining bleeds) and once I got 5cp I would use FB. I believe just spamming Shred you would lose some dps as you're just wasting cp. But with that if Rip or SR will drop, Id make sure to put them up before I use a FB, Unless I got 5cp up and SR is going to drop, Id use FB and then just put 1 or 2 cp SR just enough to maintain it to finish of Berserk.

I haven't seen this posted on the Feral guides before, but a NElf can shadowmeld in cat form. Doing so allows the use of stealth abilities while stationary; while minor, there are certain scenarios where an immediate stun (Pounce) is helpful, or a Ravage mid-fight (when the target is over 80% health especially). Fights like Madness allow the use of Ravage every two minutes, which can be helpful for starting off on an Arm or Wing for combo points.

~ Prowla (Undermine)

Well like I said, with 4pcT12, that is definitely the case, I can't remember if they also buffed FB in the same patch to make it better to FB during berserk, but I know prior to 4.2, during berserk you would just shred spam.

Had to do some digging and found this:
Ferocious Bite damage has been increased by 15%. In addition, its base cost has been reduced to 25 energy and it can use up to 25 energy, for up to a 100% damage increase.

1 ppm, stacking buff starts at 19 seconds left and ends at 0 seconds left

so 1 seconds of 1-9 stacks each, 10 seconds of 10 stacks

So, I've looked at several tutorials on rotation feral cat / feral bear .. However they do not teach all the orders which you must use the skills, but simply uses them as I wish someone would show the order to use a rotation with high dps for raid / pvp

As far as Raids and PvE is concerned there isn't a set "rotation" (beyond the preferred optimized opener). Its more of a priority system now. With procs and CD use the priority shifts and skews so much that saying do step 1-4, rinse repeat just doesn't work.

To state the obvious, there's a section in the first post of this thread labeled "Rotation." You should check that out and practice it, as it will get you most of the way to optimal DPS.