Product review (5 stars): Just what I needed
I got this to clean out the dryer vent. At first I thought it wasn't long enough, but apparently it reached pretty deeply into the venting.
After fishing out what lint I could from the inside, I turned on the dryer for a few minutes, and wow, what a load of stuff blew out. Would seem this brush did exactly what I wanted it to! The dryer is definitely breathing easier now--heavy loads, e.g. towels are drying faster.

It's also been very useful for loosening dust in the mechanical compartment of my cabinet depth GE fridge that has the condenser, etc. on top.