The holograms themselves were pretty realistic! The crowd that goes in is never very big so it can be a little awkward, but it's still a good experience. The scheduling for the shows can be pushed back depending on how many people actually go see the show, so check beforehand s you don't end up waiting for hours. Personally, I don't think the show is worth the price, but if you ever get some free tickets then it's a nice thing to check out if you've never seen a hologram concert. Outside of the hologram auditorium is a place to buy K-Pop goods, mostly YG but some other artists as well.
PS. Definitely take your picture before going to sit down!