The notes are actually in tune

A tuned scale means a child can pick out a tune they know. A toy that plays random pitches teaches nothing but volume.

Colour marks the pitch

Each bar has its own colour, so you can say "red, then blue" long before anyone knows what a C is.

Nothing to switch on

No batteries, no volume you cannot control, no demo song on a loop. The sound stops when they stop.

Hitting things, usefully

Aiming a beater at a narrow bar is real hand-eye work, and it gives the banging phase somewhere legitimate to go.

Is it properly tuned?

The bars run low to high as a scale, so tunes are playable. It is a children's instrument rather than a concert one, so treat it as a first step into music.

How loud is it?

Bright, but it only makes noise while it is being hit. There is no speaker, no demo track and no volume dial to lose.

Will it survive a toddler?

It is made to be struck, which is more than most toys can say. Keep it to the beaters rather than other objects and the paint stays neat.

What if a beater goes missing?

Two come in the box, so one going under the sofa is not the end. It plays perfectly well with a single beater.