The shipping was just as fast as advertised. It has good clutch power and is hanging on my wall with zero problems. The build was great, it was presented in numbered bags and the only piece related issue I had was not having the right color for two of the 1x1 cone pieces but I was able to fix that fairly quickly by switching them out with other pieces in the set. It does come with some extra ones too, including an extra base plate and like 20 of the white 1x2 bricks with the holes in the middle (not sure why they included so many).

There are a couple issues and the most glaring one of all is the background tile color. The official set is supposed to be a bluish violet color but this one is pink. Now, I don't personally mind it at all, I think the contrast between it and the galaxy itself looks great but this isn't what was advertised. The pictures clearly show that bluish violet color and that wasn't what I got. This is a huge issue and one that should be mentioned to potential customers.
The other issue I had with it was the tightness of the technic pieces. The back of the build has you use these pins to connect the plates together so it doesn't fall apart. That's fine but the issue is how hard it is to properly push in the pins. I had to use a pair of locking pliers just to squeeze them in. This is good news since it practically guarantees this is never falling apart but I would imagine this would cause significant frustration to those who have a weak grip and don't have this tool with them.

At the end of the day some issues are to be expected since this is half the price of the official set. I think if you know what to expect and don't have super high expectations then you'll be just fine. I do recommend this set despite the issues I have with it.