My wife loves it.  Outgrew the old one due to pregnancy.  She didn't want to spend a mint on a new one.
Its not super supportive.  She uses it for light exercise.  (pregnancy aerobics etc).  she says its great, and you can't beat the price.  I can't speak for it personally, but it certainly feels like it would be more comfortable than the "standard" spandex name brand sports bras.