Product review (5 stars): This Thing Blows!
I am very impressed with this product. If your dryer airflow needs a boost, this is for you. Install it and forget about it.

My exhaust ducting is about 24' with several 90 degree turns, making it effectively almost 50'. My poor dryer didn't stand a chance and would keep tripping the over-temperature thermostat. I tried brushing out the entire duct with no luck. Adding this booster makes my dryer complete a cycle in half the time with clothes that are actually dry!

I decided to mount this upside-down at a slight angle, removing the feet. This allowed me to connect the output directly into the wall port and aim the input toward my dryer. I used a 90 degree sheet metal elbow and a flexible aluminum duct to connect the dryer to the booster. Since the booster was not quite perpendicular to the floor, I removed the pressure sensor box and mounted it to the wall. The pressure sensor hose just sits in the high pressure input of the pressure sensor box and was looser than I wanted. I put some gas thread tape on it to get it to be a little snugger.

I had terrific responses from my pre-purchase e-mail query and my during-installation phone call. The owner is friendly and sharp.

One possible design improvement would be to have the AC input box sit on the side so that installations like mine would be able to have the dryer sit back a couple more inches.

After installation and adjusting the pressure sensitivity, the booster comes on whenever the dryer is on and shuts off right when the dryer does. It is louder than without it, but not annoyingly so. It is enough to know when it is on or off. I ran my dryer without heat and used my duct brush to remove the lint that was built up. It "snowed" during much of the process.

In addition to drying clothes better and faster, I think this product will pay for itself by reducing wear on my dryer. I highly recommend it if your exhaust duct is more than 10' or so.