I got these for an Irish dance class that I'm taking at my university.  I was wearing sneakers, but these are so much more comfortable and really made my steps nicer.  I got them in black so that they wouldn't get dirty.  I have never had dance shoes before, so I have nothing to compare them, but after a lot of research I got these, and I was very happy with them.  After reading the reviews, I was prepared for the sizing to be off, so I checked the sizing chart at this site:

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In the end I ordered a 10N (and I normally wear a women's 8 1/2), and they fit very well.  Because of the shape of these, they really hug your feet, which make it very comfortable and give you a little more support.  They also have elastic all the way around the opening, which you can tie for just the right fit.  Also, they come with the criss-crossed straps only sewn onto the back, so you can personalize the fit.  With my sewing skills they ended up a little crooked, but they fit nicely.

Also, as some people noted, the bottoms tend to get a little slippery.  I would recommend maybe using sand paper or something to just rough it back up.  I used a finger nail file, which was the only thing I had on hand, and it helped a lot.