I get asked a lot, usually by someone holding up two nearly identical-looking pins, what actually separates a nice hair accessory from a cheap one. It's rarely obvious from a photo. It comes down to two things: color match and construction, and you can usually feel both before you can see them.
Color match matters more than people expect. A hair pin in a generic "blonde" or "brunette" shade almost never matches anyone's actual hair color. Real hair has variation, warmth, depth. A pin that's slightly off from your actual tone catches the light and reads as hardware instead of disappearing into the style. That's the difference between a bun that looks finished and one that looks like it has something stuck in it.
Construction is the other half. A well-made pin holds its shape, keeps its tension over time, and doesn't bend or splay after a few uses. A poorly made one loosens, which is why so many people end up buying the same cheap pins over and over, replacing them every few months as they wear out.
For an elevated look, whether that's for work, an event, or just wanting your hair to look done without trying too hard, I'd rather see one well-placed, well-matched pin than five mismatched ones fighting for space. A large hair pin used correctly in an updo does more visual work with less clutter than a handful of smaller accessories layered together.
This is really the whole philosophy behind how I designed the Day Rate line. Hold first, appearance second, but appearance still matters. A pin should do its job quietly enough that what people notice is your hair, not the hardware holding it up.
If you're building a small collection of hair pins for women that you can actually rely on for different occasions, I'd start with one pin sized to your everyday hair and one built for when you need more hold, like for an updo or an event look.
The Power Pin is the one I reach for when a style needs to hold for a full evening without a single adjustment. It's built for exactly that kind of dependable, elegant hold.