I've seen many members' respect for the 3666 and steck system in the posts I've looked through. After trying out a system x castle, I was disappointed both in the relative flimsiness of the material and the fact that it was not compatible with the older system. I am a 3666, medieval-steck devotee. My first 3666 came without its box, but with some cut-outs of pictures, presumably from the 3666 box (the prior owner had combined a few sets in the sale, all from roughly the same time) that have some beautifully layered set-ups, with steps disappearing behind walls and everything else contributing to the look of a more expansive city just behind the facade. I'd like to achieve a look that combines the almost labyrinthine appearance of those images with frontal areas to set up little scenes.
I'm so excited for Monday! I bought my second 3666 for $70, including shipping (no figures, but complete castle), along with a second baron's tower for $55 (also included shipping.)