While United lost out to 'noisy neighbours' Manchester City on goal difference in last season's Premier League title race, the Welsh midfielder is confident that Van Persie comes ready to deliver the goods, having netted 30 Premier League goals for Arsenal last season.
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The £22 million (€30m) transfer fee and Van Persie's age represent a departure from Sir Alex Ferguson's recent transfer policy of securing young players with a high sell-on value, but with four goals for the former Arsenal striker already this season, Giggs insists it is a great deal for United.
He told Sky Sports News: "The goals that [Van Persie] scored, and his performances in general, it's obvious he's a world-class player.
"The manager's policy over the last 10, 15 years is to buy young players and develop them, the likes of Cristiano [Ronaldo], the likes of Wayne [Rooney].
"But Robin's a ready-made world-class star and is proven. I think he's shown that in the first few games and I'm sure there's more to come."
Losing out on the final day to bitter rivals Manchester City was galling for the United squad, and Giggs feels that the addition of the prolific Dutchman could make the difference between the two Manchester clubs if the sides are neck and neck once more.
"We lost it on goal difference, so hopefully the goals that he's bringing, if it does come down to goal difference, then we'll have the upper hand this time."