Pros : I got the whole line of these tiles for doing mosaic work--we love them! The colors are beautiful and the textured pattern in each tile is a whole world in itself closeup and adds a lustrous quality to my work. The patterns are very organic as well, so you can use these for trees, leaves, etc. They're useful in any work that is not meant to be see-through, but they're mirror-like finish makes them add pop and life to your work.
Cons : Back finish needs a bit of extra care when grinding edges (use FINE bit) and soldering (use Mirror sealant)
Other Thoughts : I also highly recommend the Van Gogh sheet glass--just remember to use a fine diamond bit when you sand edges and use mirror backing spray so the flux doesn't damage the tiles. It's well worth the extra effort to get the rich, elegant feel from this glass in your work.