Product review (4 stars): Must for HE gas dryer
My experience with other vents was not great - they restrict airflow, allow cold air in and tend to get dirty.  This one works very well and completely seals cold air out.  It is very big though - a conversation piece :).  My only concern is that the top lid needs a better latch.  It is a bit lose and rattles.  I placed a rock on top.