My 25 man raiding group got Saurfang and Blood Queen down on heroic the first night of raiding for the week. Unfortunately I was not able to make the second night because of family stuff. Still, it's fairly exciting to be well along the way to finishing out a lot of gear sets (2 whole tokens on the path, but certainly more on the way!).
The Saurfang fight was very stressful for me since a missed/late taunt means the other tank is dead.
Blood Queen on the other hand was just as boring on heroic as it is on normal. Quite literally the most boring fight to tank in the instance. (Barring Gunship which doesn't really count)
We also made some attempts at Valithra but were not able to kill her. I was getting very frustrated by that fight, mostly because of the rot worms which spawn out of the abomination's corpses. I don't seem to have quite enough taunts to keep them off of the ranged and leaving them alive the extra time it would take to establish true threat on them is too dangerous because of their damage output.
Hopefully next week I can make both nights and maybe even get a heroic tier token now that all my tier 10 pieces have been upgraded to 264.