For the seasoned switch enthusiast, all you're really spending the $20 on is the holy pandas, halo switches, and maybe the box jade. However, it's a solid sampler set if you're new to the game. Holy Panda is the holographic card in this booster pack and it helped me decide if I should buy the pandas in bulk for a build.
I had never built my own keyboard before, so I was unfamiliar with the differences between the switches. This was super helpful in deciding which switches I wanted to put in my board. I'll definitely use it again in the future next time I want to "switch" up my keyboard.
I did buy this before realizing there were larger sets available from Drop, but I ended up sticking with these. There's a good chunk in this set to choose from. I am a first time keyboard builder so I bought these before choosing which switches to go for. I am glad I got it first to feel out the differences rather than choosing a random switch type, and it's nice to have a compact and less expensive sample set like this one available.
Decent assortment of switch type, weight, and sound profiles. Not the absolute best option out there, (by price and selection) but still solid and helpful if you're new to the hobby.