These tiles are great for use. The art is fantastic and of high quality despite being simple design. Setting them up is a breeze, you print them out and apply to the surface you want. The author uses regular paper and a gluestick, but I recommend going to Walmart or Staples or a similar store and buying full page label paper for your printer. That way, you don't need a gluestick.
Also of note, if you don't have a printer or can't use it like this, the author has teamed up with a company called squarehex to sell pre-printed sections of the most used dungeon tiles that come in small and large quantities for 3 and 9 pounds respectively. DriveThruRPG does not allow HTML in their review, so just look up Squarehex's website and you should be able to find it pretty easily.
And if you play online, these tiles are still useful, all it takes is some manipulation in a program like Photoshop or GIMP, and you can make the tiles you need for the dungeon you are making.
These tiles are "Pay what you want." You can get them for free is you wish, but I like to pay a dollar or two because these tiles are definitely worth more than free.
[4 of 5 Stars!]