Product review (5 stars): It's holding up great. It might be my imagination
I wanted to get my dryer as close to the wall as possible so I could have more room in my laundry room. This periscope did the trick. It's been two years now, and running strong.

After I sized it, I got aluminum tape (not duct tape) to wrap around all the seams. It's holding up great.

It might be my imagination, but I think this is actually drying my clothes a little quicker than the old plastic ducting I had.