Mr. Wonderful installed one of them in our kitchen 2 years ago. I want another one installed in the girls' bathroom (it's on the inside without a window).
It doesn't leak and it works beautifully. It refracts against the tubing and puts out a lot of natural light. I love mine! We went for it after a friend installed 5-6 of them in her house with similar feedback.
Home Depot and Lowe's both sell them and you can hire the contractor directly from the store. I'd loan you Mr. W., but he's on hiatus for me on these types of things, so you can't have him until I get use of his bod for my own projects.
Good luck!
Betsey
"There are only 2 ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."
Betsey 
