My daughter is a beginner, it works perfect and she loves the color

You can use your own mouthpiece of course, and this will make the instrument sound demonstrably better, but then you won't have a cool colored mouthpiece (unless you opted for the black model in which case this is be a good option.

I bought this for my daughter since she needed a clarinet and her favorite color is blue

My granddaughter is just learning and she loves the pink color

My 9 year old is playing it, and she loves the color, standing out from the other players

Love the color

Again, using your own mouthpiece and reeds will greatly improve this instrument if the color is not an issue for you