I bought the Smart Box after watching the demo video and I thought, "Great! I wouldn't have to buy (another) hole saw. (I lost two before using them.) The video was helpful. However, what hasn't been mentioned is that the teeth can actually jump up the wall and leave a claw-like arc if you don't grip the drill tightly! Slightly tilt and hold the drill bit, then straighten it to cut through a wall or ceiling. A hole saw makes a perfectly round plug. Don't rush to cut the hole, as the plastic (or resin) shark teeth on the hole saw will wear out before you're done cutting the hole. The cutting teeth on my smart box were so worn they couldn't cut through the entire drywall base, so work on the hole quickly. I just wish there were instructions on how to easily (or properly) remove the wire tabs and install the box. I rolled mine well. The best I can explain is that after removing the cutting attachment, you break one of the tabs on the back or bottom of the box. Pass the wire through the box with the hole and then insert the box into the hole. (This will be a snug fit.) A little wiggling and rocking as you push helps. Make sure the hole you made in the box is positioned to face where your wires are coming from. I was using an old working box so it was important to know this before putting the box in place as the wires plugged into the wall seemed to dictate how I would manage to get more wires out after installing the box. The can has a flange. So slide it in until the flange is almost flush against the wall or ceiling and turn the 3 mounting screws until they retract your box all the way back into the hole or until the flange is snug against the wall or ceiling. I think I should mention that you should also keep an eye on the vapor barrier. I accidentally made a small hole in ours while punching a hole in the drywall backing when the sharktooth hole saw teeth wore out. I used the Smart Box to install a wall light in my kid's bathroom. I replaced her light when I discovered there was no work box behind it. It's just that the wires get stuck and stuffed into an uneven hole in the wall. I decided I should finish it to code and turn on the lights as it was significantly larger than the original. So big it hung in front of her bathroom mirror. The hole made through the smart box crown left me with a plug that fits perfectly into the gaping hole left by the builder. The 3 mounting screws held the box securely in place and provided much needed support for their large wall light. The risk of fire was quickly reduced! I wanted to use the smart box again when moving the light in the kitchen but don't you know. One of my hole saws showed up! Rschunimagu