I'm going to go the opposite direction of Karak. I've got some of Fat Dragon's sets (Copper Dragon Basic Dungeons, Dragonshire City Interiors, Dragonshire City Ruins, EZ Dungeons Mechanical Traps, Lost Reich bundle and the F-211 Copperhead -- my fav!), and they're good quality.
Most of the PDF's have instructions and tips to help you get the best possible results. The downsides are that the models do eat up a fair bit of ink (they are color and have good detail - I'd say superior to what you find on the likes of D&D's dungeon tiles), and it takes some practice to get good results - I wasn't happy with my first two projects when I was starting out before I got the hang of things. If you've ever put together plastic models or assembled miniature figures for other games, putting the pieces together is a snap.
The biggest problem for me has always been storage - the fold-down system looks like it well help with that a bit; I'd imagine investing in a tackle box would make this quite portable and storable.