In Spanish there is a structure that is used to talk about something/someone's quality. This specific structure somehow highlights that quality. For this we use:

Ser + de un/una + [noun+ adjective]

It is generally used with certain adjectives that are either very positive or very negative. Have a look at the following examples:

Estos productos son de un sabor exquisito.These products are exquisitely flavorful.

La maquinaria es de una categoría superior.The machinery is of superior quality.

Esa cantante es de un talento extraordinario.That singer is extraordinarily talented.

Su vestimenta era de un gusto pésimo.His outfit was appallingly ugly.

This structure is not common in colloquial Spanish; it is more formal and slightly more poetic. 

If we wanted to convey the same meaning in a more colloquial way, we would simply have said:

"Estos productos tienen un sabor exquisito."

"La maquinaria tiene una categoría superior."

"Esa cantante tiene un talento extraordinario."

"Su vestimenta era muy vulgar."

See also Using ser de un (adjective) que

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Examples and resources

La maquinaria es de una categoría superior.The machinery is of superior quality.
Este plato es de un sabroso que querrás repetir.This dish is so yummy that you will want to have seconds.
Manuel es de un inteligente que nos sorprende a todos.Manuel is so intelligent that he surprises us all.
Estos productos son de un sabor exquisito.These products are exquisitely flavorful.
Esa cantante es de un talento extraordinario.That singer is extraordinarily talented.
Su vestimenta era de un gusto pésimo.His outfit was appallingly ugly.
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