I have used this die to cut both balloons and their 'strings'. It does an excellent job of cutting both, making clear, sharp cuts. I put two layers of card stock through my big shot at once so that I would have to make fewer runs/cuts and it still worked beautifully. I had no problem separating the strings from each other after cutting them double, either, and I had been concerned. I did not use the 'window' which was provided for the balloon so cannot comment on it as it was not necessary for my project.
Lawn Fawn always thinks through their die cuts. This balloon die includes everything you need to make complete balloons with a variety of shapes, the base of the balloon and two different strings. I use watercolors to make a great background and then die cut the balloons. I have purchased Lawn Fawn stamps and dies and they are always quality products. I also really like Scrapbook.com. They are professional and are extremely fast with their orders.