Product review (5 stars): This one actually works!
I had no idea what I was doing when I searched for "dryer vent". This is the first time that I've ever needed to purchase a dryer vent. I was looking for something small. I went with this purely by the reviews.

So, this is a pretty large piece of plastic. However, it really works. It's better than having mesh over your heater pipe, I found. With this vent, my dryer actually dries my clothes and towels. It also prevents small animals from climbing getting into the pipe.

It needs to be screwed into the wall and, as you can imagine, sticks out by 6-7 inches. Fairly simple process.

I will be purchasing a second one for my in-laws.