Pricey writes the new price onto your products, so a sale shows everywhere the price appears — storefront, search, feeds — not only in the cart.
They start and end at the times you set, or you switch them on and off by hand. Either way the full price comes back.
The new price is written on the product, so shoppers see it on the storefront — not only once they reach the cart.
Bulk edits show every line before and after, every change is kept with its author, and the last one undoes in a click.