We played Fat Goblin last week, first quest after the intro, so the heroes (Runemaster Leoric, Necromancer Tarha, Disciple Ashrian and Knight Lord Hawthorne) only replaced the necro staff with a sling. I used Merriods as they seemed strong and I wanted to try out the new monsters. The merriods totally stymied the heroes' advance, the black defence die was powerful and their attacks pretty effective. The heroes still managed to kill a goblin and keep one crop (the knight's OoH and Advance skills are pretty nice to make him jump far forward, even over monsters if the near squares are occupied).
Second encounter was a steamroll for the heroes though as the monsters (I used trolls for the open group, wasn't impressed with their inability to use surges, it seems bash is the way to go with them) couldn't do anything and wouldn't stop the heroes for more than a turn. I only found Fredrick on the 4th token and by then the heroes had completely blocked off the hallway, no reinforcements hurt a lot. They managed to buy 4/5 items, 2 leather armours, 1 chainmail and something else, plus they found a broadsword in the quest.