Remodeling - Running wires, better than wire nuts

I had to move a couple of switches, and install a new closet ceiling fixture at the rental.  While I was doing it, I tried to get up to code as much as I could, so I installed junction boxes for two of the connections.  Another one had wires too short to make an accessible junction box, and I couldn't replace the wires, so I just reconnected them.  I found these at Lowe's.  I hate wire nuts, especially with thick wire, and these saved a lot of trouble.  They come in different sizes to connect 2, 3, or 4 wires together and you just strip the wires and then push them in.  They have a possible downside that they aren't removable (at least without a lot of trouble) but if you know you're hooking up the right wires, that shouldn't be a problem.

Anyway, as far as I can tell electrical code requires junctions to be in accessible boxes, so I used these single-gang outlet boxes.  I couldn't find blank plastic face plates for the normal metal junction boxes, and I didn't want ugly metal plates.  These will take a standard blank faceplate.  They also attach from the front of the 2x4 instead of from the side, so no swinging a hammer in a small space, and the lip automatically aligns it to sit flush with the drywall when it is finished.