It's great to go and experience the main square, both during the day and after sunset as most books say. The place has a very different character at each of these times.
However, it's not really anything special. The food stalls look great lit up with all of the steam but the people are so pushy, in your face and a general pain that it makes it a bit tiring constantly saying no or swerving the idiots who try to touch you and lead you into their stall or store.
Worth a visit but you're only going to love it if you like busyness and annoying people.