I like them a LOT more than flat screens. I think they are easier to read and more vibrant.
'Vibrant', yes, but they also mess with one's perception of contrast. Try editing a photograph on a glossy screen and then printing it. Even on glossy paper the colours will look dull and everything but vibrant. That's because the glossy screen is basically lying to your eyes.
Just to add to this, there's no way you will be able to find a professional LCD anywhere which even has a glossy option. This is because of the above reason. It would make any kind of accuracy in Photoshop, 3D modelling apps and anything else which requires colour accuracy impossible. I know this for a fact because it's what I do for a living.
The real reason why glossy screens are so popular is because most people are dim-witted sheep who go for that which is the most shiny. They also tolerate crappy TN LCDs, backlight leaking and heavens know what other defects and keep asking for more by buying the cheapest and shiniest junk they can find.