GMK is considered one of the best manufacturers for custom keycaps, but they're definitely overpriced -- and this set is even more expensive than usual GMK group-buy sets because it's kept in-stock year-round by Drop. For most beginners, this, Red Samurai, and GMK Laser might be some of the only GMK sets you can buy right away.
But you shouldn't. At least, not without research and knowing this is exactly what you want: A GMK-quality set, with this specific kitting, in these exact colors, RIGHT NOW.
If you need keys that aren't included (check very carefully), this set isn't for you.
If you don't like the true-to-life colors (check review photos here, and photos on r/mechanicalkeyboards by searching "GMK Blue Samurai" there), this set isn't for you.
If you don't want or need to spend $100 on keycaps right now, this set isn't for you.
I used these for a build for my partner, and they worked great. He really liked the color of this set, and needed a set quickly. Had all the keys we needed for a YMDK split 75% build, including split spacebar support. There are some limited amounts of keys in the right profiles though, and the base kit doesn't come with novelties. The novelty kit is wayyyy overpriced and he wasn't sold on them, so we skipped it.