I just started running a game using Shackled City yesterday. I had already read all the series when it came out in Dungeon magazine and was pretty excited to run it, but I decided to buy the hardcover for ease of keeping everything together over a 20 level campaign. I was not disappointed. The hardcover adds bits of extra information and ties in everything even tighter so that it's is now definitely worth of being called a D&D classic. It makes it really easy to run a campaign that has both plenty of interesting combat, traps, tricks, clever opponents, and tons of roleplaying opportunities for players that enjoy developing their characters.