Currently running thunderspire now. We ran through the first encounters on saturday and managed to finish the chamber of eyes. Things i found were:
The Seven Pillared Hall: An awesome little polder, my players really liked it the npcs and locations; the half-orc tap room brought much interest, and i'm going to run a bar fight in there next session.
The Chamber of eyes began brilliantly with first encounter with the bugbear guards and goblins.
The next encounter the guys ran into was the duegar; but for us this quickly became a staid encounter. If the PCs go this way, they fight in a cramped room (which was interesting) but Krand is nigh on useless here; they had heard of him and were nervous when i let slip the big huge hobgoblin was him, but when it came down to it they polished him off without much worry.
Following this, they went to the "main room" with the chamber of eyes, with the direwolf and archers. I can see how this would've been an awesome encounter if the pcs had come in through the western entrance, but via the north door it was pretty impotent.
After this, the final encounter we had was the most southern room with the "left over" humanoids. I actualy thought this was a fairly boring encounter, so i took away the human bandits and threw in a werewolf (their guide to the chamber was terren darkseeker, who's mentioned as an npc. he basically gets hit with an arrow by goblins and turns into one).
Opinions so far:
We played for 5 hours, and by the end we were exhausted and as a dm i was a little bored (and i think my players were too; "more hobgoblins?" i could imagine them thinking). the werewolf, the bit i added, was my favourite bit, just to see the look on the guys faces when they contracted moon fever (although we played 3.5 and they think they've contracted lycanthropy
)
I've tinkered with the horned hold adventure for next session to reduce the number of encounters so we could finish it in a session. I'm looking forward to it as one of my players has a dwarf character and he and the duegar had got off to a bad start last session, so i think he's looking forwad to kicking some ass next sunday