Product review (5 stars): Great product
Put this in the vent line combined with a flip lever vent for venting into the house in winter.  Works great, and filters about 90% of the lint missed by the dryer screen, which for us is a substantial amount.  We were constantly fighting decreased efficiency over time with lint lining the PVC tubing we tried instead of the less efficient flexible hose.  The screen on the flip vent catches the other 10% for a great system.  Even when we go to outside venting again in Summer, this will substantially reduce the number of times I have to clean the venting system each year.

Easy to clean, durable screen.  Make sure the dryer is "off" before cleaning, or you will get a face full of lint.  Yeah, you're saying "duh" but if I hadn't told you, you'd have done it too eventually ;)  Great product.  Highly recommended.