Top critical review
Unable to attach grounded plugs in most sockets
October 28, 2018
While all sockets will accept ungrounded plugs, the majority of the sockets in both of the two units that I ordered will not accept the ground prong (and the sockets that will accept the prong require a lot of force to do so) - it appears to be an assembly issue with some internal part/casing blocking the ground.
Edit: Amended 2/5 review to 3/5 after struggling with grounded plugs and finally getting them plugged in (we're talking significant elbow grease, putting my full body weight into it) I'm finally able to get grounded plugs into every outlet - though removing plugs requires significant force as well (and pliers).
This product can be used as you'd expect and performs as expected, though it's a hassle.