I ordered size US 5, because ASOS shoes tend to run big in my experience. Unfortunately, my sizing assumption was a little off this time. My feet are a true size 6, but these flats fit like a size 5.5...so it is a bit too snug and pinchy for my feet. The pointy-toe also contributed to the pinching, especially with vigorous walking. Thus I recommend ordering your true size, if you are interested in these. The polyurethane material doesn't seem like it would stretch much over time as with genuine leather.
On the positive side, the rose-gold color is so pretty! Here's how it compares to my Velda Loafers:
The ASOS Lucky ballet flats definitely look daintier. The polyurethane material is a lot lighter in weight than the leather Velda loafers, yet it seems sturdier...the pebbled metallic material seems like it'll last longer than the gold-paint-on-leather of the Velda (which I'm sure will scratch and rub-off over time).
The rubber sole is also very lightweight and flexible.
Aren't they pretty?
Overall, I'm convinced I need a pair of metallic shoes in my wardrobe.