Product review (5 stars): Works better than expected!
After reading the reviews I took a chance and bought one to see for myself. The installation didn't take as long as I thought it would. I had no problems at all. I spray painted it white with spray paint made for plastic. Before installation I did buy a tube of silicone caulking to ensure a tight seal on the interior as well as the exterior of the vent. My exterior is stucco, and I had no problems with any of the supplied hardware drilling into the exterior of the house. I even pre drilled some holes which really wasn't even necessary. After installation was complete, I squeezed a small bead of caulking around any possible gaps to make it air tight. It worked! I let the caulking set, then  took off the top cap of the vent while my wife turned on the dryer inside. The round cap inside the vent flew up in the air and out of the vent. Obviously this meant I had a pretty good seal. The next morning I opened up our laundry room door and noticed a pretty big difference in temperature as compared to the ice box feeling we used to get when going into our laundry room. To us, it is worth the small amount of money to make our laundry room less drafty and so cold like it used to be. I don't know how some people have such a hard time installing something so basic, and complain about having to squeeze out a little caulking from a tube. Don't believe the negativity. if your laundry room is like ours was, buy it. It's not going to heat the room but will definitely help keep it warmer in the cold season and keep the bugs out. We're very happy with the purchase.