Golgfag's mercenary ogres

Has anyone used Golgfag's Mercenary Ogres in an army? Are they worth it in an OK army? Correct me if I'm wrong, but isn't just like a unit of bulls with a bruiser? (except a rare choice?)

I'm sure  they talked about this in one of the WD issues not sure which one but you have to use the stats and rules that are given for them. And they don't get any of the benifets of the new Ogre rules no Bull charge and the can't have gut magic cast on them. So I don't think it would be worth it. Golgfg's was talked about a little when the Ogres first came out but I haven't heard much about him since then. Hope this helps a little.

From my article on Ogre units and characters

Golgfag's Ogres

The main thing about this unit is that it's actually rather cheap, if you don't mind the somewhat odd equipment they have. Certainly, a unit of Bulls with additional hand weapons, light armour (instead of heavy), a full command group and a Bruiser equipped the same way would cost you more than 300 pts using the Ogre Kingdoms army list. So if you want that kind of unit (I must admit that personally I don't) and are prepared to swap a Hero + Core choice for a Rare choice, then there is no reason not to take them. Hopefully, 7th edition will see a redo of their rules and bring them in line with the army book Ogre units.
Golgfag: A Bruiser with +1 Attack is not too shabby, though normally you would not want to give him an additional hand weapon. A bit prone to getting shot, what with no option for a Look-out Gnoblar.
The Ogres: The price for additional Ogres is a bit stiff, though not excessively so. If you ask me, there is not much reason to go beyond the initial unit size of 4 Ogres.

1) the standard bearer also has 1 additional attack.
that's really cheap

2) you have to distribute to kill the bearer, skaff, jus like a champion, right?
how many models in total do we need to protect skaff and golgfag?
thinking of adding to protect them from missile fire.

3) so you cant cast gut spell on them?

No, no gut magic, although I know next to nothing about Golfag's, never having been interested in including them, you can't normaly take out the standard bearer, as another soldier takes his place carrying the banner. Are Gofag's an exception?

Has anyone used Golgfag's Mercenary Ogres in an army? Are they worth it in an OK army? Correct me if I'm wrong, but isn't just like a unit of bulls with a bruiser? (except a rare choice?)

They are more then just a unit of bulls, more like a unit of cheaper ironguts, substituting the great weapon for an additional hand weapon. The individual ogre cost is cheaper then ironguts, and the heavy armor will benefit in combat. As Leongnling and Avian stated Skaff and Golgfag both get an additional attack. I think they are a great unit to use.

But to address your original question of are they worth it, my answer would have to be depends on how you build your list and the point size. I would not take them with a list of under 2500 points, mainly because giving up the rare slot can be a huge factor. I like to run with 2 gorgers, so I don’t use Golgfag. Although I think he can be very useful if you use a slavegiant or to accompany a unit of maneaters. With the presence of an additional bruiser, you can use the points for a hunter or more butchers. I do intend to use them soon, when I feel the conditions are correct.