As for material quality, it seems sturdy and not flimsy or lightweight. However, it has two negatives:
1) The holes behind the number are short, and I don't know how securely they will stay on the wall with the anchors. I put a bit of silicone just in case.
2) The paint quality is not very good, resulting in the number looking aesthetically bad if it is placed at a low point. However, at the height I placed it, nothing is visible, and I hope over time it won't get deformed by sun and humidity.
I believe at 5-6€ it would be the perfect purchase