Cynthia, my parents had one installed 10 or so years ago.
It is very easy to install since it just fits between trusses. No cutting of structural members is required.
They had it installed in an interior bathroom (They live in a duplex) and absolutely love it. Depending on the weather it gives light comparable to a 40-60watt lightbulb. At first they had several people look for the light switch, since it gave so much light!
Their neighbour promptly had one installed in his bathroom, since He was so impressed with theirs.
...art