Product review (5 stars): Easily saved the purchase price in lower heating bills and increased comfort in the first month!
Wow,  this has made a tremendous difference in the temperature of my laundry area in the winter!  I used to get a blast of freezing air in my face every time I opened the dryer but now it is downright comfortable in the laundry room and I don't have to worry about letting in the cold air.  I haven't noticed such a large difference during the hot months, but I air-dry my clothes more often than not in the spring and summer.  Installation was tricky since I have brick siding and the dryer vent is right next to the A/C unit-- otherwise, it was easy to install by myself with the help of a little extra caulking.