I read many reviews about their being too small and sized up one size.  They are too big.  I suggest your regular size if you order.  I noticed that many older reviews stated that they run small, but many newer ones say they are true to size.  I think that sometime recently, the company must have changed something at the factory to make them true to size.  I just don't think that many people made a mistake of some kind.

The reason I gave only 2 stars is that the mint color which I ordered is not as shown.  It's a dull turquoise.  This is one frustrating thing about ordering on the internet--colors not shown accurately.  Hopefully, technology will improve that.  Also, in the picture they have a nice shape.  Actually, they don't look like that.

Overall, I think there are other shoes on Amazon that are better.  Breckelle's Cherry 11 Basic Classic Round Toe Slip on Ballet Flat is good for this price range.  At the time of this writing, it's available in mint, which is actually a very light turquoise, my favorite color.
I have mint and light turquoise clothing.  It matches the light turquoise clothing exactly, but would still be o.k. with mint clothing, which is very popular right now.