Product review (2 stars): Terrible quality control from what has always been a reputable company.
Half of these female Leviton plugs I have purchased recently, will not accept a male plug. So if you want to use one, you need to buy a 2-pack to have a 50% chance that one of them works.  Terrible quality control from what has always been a reputable company.

I have had no problems with the comparable male plugs.