Hi M, congratulations on the gift. I've used fruits and fruit purees when I've added fruits to beers and mead and don't have any direct experience with extract. But, if the kit came from Austin Homebrew Supply, they make quality products and I wouldn't hesitate to use it. Also, you could send Forrest at AHS an email - he could give you some advice on the kit, too.
I need to make another fruit beer soon, its been too long!