I was worried by the reviews complaining of the button causing discomfort, but went ahead and ordered them anyway. I found these shoes to be absolutely lovely and quite comfortable.

1. I usually wear 6.5M and ordered 7M in black.  It was a tiny bit big, as expected.  Given that these are high-heeled and a little pointier than an almond-toe style, you can't expect them not to be fitted near the toes.  For those whose feet slid forward and crushed their toes, I would recommend wearing gel pads to keep your feet in place.
2. One thing I did not expect (but should have, given the low-cut style) was the toe cleavage that could be seen through the two gaps at the front.  It wasn't an issue for me.
3. I didn't realise that my arch was high enough such that the sides of my feet are clearly visible.  Again, it wasn't an issue for me, but may be for other people.
4. These shoes made my feet look tiny, and the heel is quite attractive.  They're really very versatile and go with pretty much everything I have.  I do find them more appropriate with opaque stockings due to point 3, but that's a personal preference.

I'm glad I've taken the risk of ordering these shoes despite some unfavorable reviews.  Perhaps the quality does vary from order to order, but from my personal experience, I highly recommend these shoes.