I've purchased all of the dungeon tile sets and this is my favorite one so far. Unlike the underdark set, this set contains a lot of nice big rooms - something I really need for a good encounter. It also contains far fewer small pieces - pieces I rarely use.
Because the color of these tiles are unique, you may want to purchase more than one set. They won't work too well with the other sets so you'll want plenty of pieces to build whatever dungeon you want.
The best way I have found to use these tiles is with a large poster board and some poster sticky putty. Sit down at a nice big table, lay out your dungeon on the poster board, and when you have it where you like it, use the putty to stick it to the board. Change it around whenever you wish and be sure it won't shift on you while you're actually playing.
Within a day I had a nice dungeon built and an entire scenario written around an ancient tomb cracked open by a vile snake cult. I can't wait to play it out.
After figuring out my poster board trick, I'm now a lot happier with dungeon tiles than I was previously. I recommend the purchase.