I bought a couple of pairs of these shoes when I started taking ballet classes again about a year ago. They are very comfortable and I have had no problems with sizing. They come with shoe elastics attached on one side so that the other side can be sewn wherever the wearer finds it most comfortable; I also bought some pink satin ribbon to attach onto the shoes in the traditional 'ballerina' style but this would not be absolutely necessary, as the elastic does a good job of holding the shoes on by itself.
The shoes are excellent quality and good value for money, with average wear (about 4-5 hours of ballet classes/practice per week) each pair lasted me about 3-4 months before I needed to replace them. Though I would imagine that if worn less often they would almost definitely last much longer!
They are also quite easy to clean, I personally favour a sponge-cleaning method with mild baby soap or shampoo and rinsing in warm water, then leaving to dry flat on a tea towel in the airing cupboard. This is useful because the light pink satin fabric covering the outsides of the shoes does tend to become grubby quite quickly on dusty or sticky dance studio floors.
I'd definitely recommend these shoes to anyone who takes ballet lessons. Hope this helps!