Product review (5 stars): Worth the upgrade.
Seems silly, but completely worth the extra cost for this versus an off-the-sheft vent. this makes all the difference on how much outside air gets into your dryer and laundry room. The temperature difference is very noticeable, especially since I installed ours during the winter. As others have said, I also took mine apart and sprayed it white paint, then a few layers of sealer to keep it from cracking down the line.