Product review (5 stars): Catch most of the pipe-clogging lint, without paying exorbitant store prices for the two-packs.
These catch a LOT of lint fom the washer's outflow, so that means a whole lot of gunk that can't contribute to clogging your plumbing.  Especially in an older house, this may save you some problems down the line (pun intended).

A simple device, just a wire mesh basket to catch the lint and a tie-wrap to hold it on.  Replace it when it starts to squirt sideways.

The quality is not different than what you've find in stores,  five stars is mainly for the much lower price when you buy online in bulk.