I have been using these boxes for years. They are solid and intelligently built. They are easy to install in a new building or when modernizing. They hold NM cables securely, unlike most plastic boxes found in hardware stores. (It's a little difficult to adjust or pull out the cables if you make a mistake). Some cable slots are labeled #12 and others are labeled #14. It really helps (almost necessary) to pry apart the plastic tabs with a flathead screwdriver before inserting the cables. There are no more razor-sharp ridges, so I'm seriously considering switching to these boxes for almost all of my work. Revain's price is comparable to the cost of metal boxes, and even if the plastic box is a bit more expensive, it's worth it without cutting your fingers or worrying about cutting through the wire insulation during installation. (I've seen this too many times). To be honest I'm confused as to how the metal boxes I've seen lately can be UL listed. It has to be true, as one of UL's employees once told me, it's basically getting a permit, getting paid enough.