I am new to 3D printing and quickly used up the small starter roll supplied with my machine. The sild sample pack provided me several colors to experiment with and a good quantity of material to print with. I feel it was a good value and I have been getting great results with the silk and got the settings dialed in quickly. I have been printing Hot Wheels garages I designed for the grandkids, blue for the boys and pink for the girls and some generic black. Lots of fun!
Works as good as any other I've purchased and its from a 'local' company so its well worth it.
I've been using COEX filament for many years and have visited their plant twice. Very friendly and welcoming. The quality has always been consistent and reliable. The Mystery PLA spools are a great bargain. Sometimes interesting colors, sometimes bland but useful for prototypes. Grab these especially when they are on sale - you will not be disappointed.