Sammydress is a great company. They have reproductions of expensive items at lower prices. This does come at the cost of slightly lower quality than the originals, but it really doesn't matter because they're still usable products. Most of what they offer is still high in quality.
The postage costs and times can be quite high, but no higher than from any other Asian website and it similar to what it takes to ship to Asia from other countries, so they aren't trying to scam you for money through that.
The sizing can be quite short, though many items are also unexpectedly wide. As it is Asian sizing I would size up if you're on the larger side.