Customers report that this product performs its intended function well, effectively sealing air conditioners and keeping warm air out. Many reviewers found the insulation to be of good quality and appreciated its thickness, noting it was often thicker than the original seal. However, opinions on value are mixed, with some finding it a good accessory for the price, while others felt it was expensive, especially when similar foam was included with the air conditioner unit or could be purchased more affordably elsewhere.