I use the Waltons whistel for about 5 years.
The copper used gives a beautiful grain
Unfortunately, plastic whistles are not always up to par.
It is common on this style of instrument with plastic whistle.
Problem is found with other brands (eg Generation)
So if possible essyez in several before choosing.
Other than that, I like the spirit of these instruments, the tone soft and supple,
and how it reacts to apogiatures (dragged and trills ...)
And really it costs next to nothing for fun.
To introduce children to the wind instruments is very convenient and somewhat expensive option!