I purchased both Tombs & Horrors and Dungeon Set 2 and they (as usual) excellently drawn items. They cover a wide range of options and uses and can be used in almost any campaign whether dungeon or just underground caverns (well perhaps not the Tombs & Horrors!).
These are far from my first purchase of Dragon Tiles and I have been very pleased with them all. It all depends on the quality of your own printer and the card stock on which it is printed. The better the quality of the card the better the result although it is best to keep away from glossy card as the ink will tend to smudge as it does not dry well (well on mine anyway). This would, of course, not happen on a laser printer.