Product review (4 stars): A very decent vent, keeps varmints out and provides good flow.
I got this years ago and set it on a shelf.  I had to move the vent as the builders placement put the vent right behind our AC unit and near the ground. Eventually we needed a new dryer and I thought it was time to install it.

Installation went fine, I raised it up to 5" above the floor to put it farther away from the AC unit. with new aluminum elbows and a semi rigid hose.  The amount of flow this thing provides far exceeds what the old unit allowed. Those old flapper type vents just get clogged up real fast.

The only issue I wish they would resolve is to make the unit out of UV resistant plastic.  As it is now, it MUST be painted.  Not a big deal really but if it were out of UV plastic I wouldn't have another thing to worry about painting every few years.

It also needs larger screw holes, it has holes about the size of #8 screws.  Larger holes could use a #10 or larger screw.