I purchased in the drop that ended August 28, 2018. It's a mixed bag, but mostly positive. See the pictures.
First of all, the numbers are indeed engraved. Note the thin letters with rough edges (printed letters have thicker strokes and cleaner edges) and the label describing the set as engraved.
Unfortunately, there are some small problems with the dice. Note the surface blemish on the 18 face of the D20. Thankfully the surfaces, edges, and corners are mostly in good order. Unfortunately, these aren't the only problems.
Several faces are engraved off-center. Note the magenta lines showing the centers of the faces below. These are the most off-center engravings shown as examples. There are 2-3 other faces similarly off-center, and the rest were better-centered.
Lastly, the faces on the D12 are curiously regular and ordered. Note the Chessex D12s, which have a better "mix." This might not affect fairness, but fair dice usually distribute their faces more randomly. I haven't checked the other dice as carefully, but they might exhibit this layout as well.
Conclusion? Pretty good dice for the price. Not perfect by any means, but they have engraved faces as advertised, and there aren't any glaring problems. If the minor issues shown here aren't deal-breakers for you, I encourage you to get them! With better quality control this could easily be a 5-star product, but as it stands it's a solid 4 and a good buy.
Hope this helps! If it does, feel free to hit that thumbs up icon. :)