Time for my final review before RoR! Draigogh's Lair is a single raid in which you get to battle a real dragon! (All those before were drakes, no matter how much they looked like a dragon.)
For a single instance, Draigogh's Lair is quite costly at 795 tp's. It's also included in the Rise of Isengard Expansion (not quests). This is a 24-man (or 12-man when doing the challenge) lvl 75 raid instance, meaning that you can only access it when lvl 75, but that's not all.
Before the raid
After reaching lvl 75, just like with the other Isengard instances (and the Roots of Fangorn), you need to do some stuff to actually unlock the instance. For this raid, you need to take the There is Gold in the Hills quest in Lagtrev. Once you've completed this quest, you can finally run it.
Strategy requires everyone to be focused. Once you know the strategy (and can execute it correctly), the fight really isn't that hard
The reward of the raid are pretty good, giving tokens for the shoulder and helm pieces of the Draigogh armour set as well as several nice pieces of jewelry, worn symbols of celebrimbor, scales to be used in crafted cloaks and fused aged relics.
The instance is a nice one, having you go into a dragon's lair to kill it off. The battle itself is pretty epic and the rewards are nothing to scoff at. The only downside is the high price, which might make a lot of people consider to pass on this one. Once Rohan comes out, it'll probably have less-than-stellar rewards.
-High tp price