"I know what your thinking "really, an in depth review about a plastic white box".if your thinking that than I can only assume you are not a sparky or you have never used one. they are very useful these days, as all builders seem to have got drywall fever. The product seems a bit "plastic-y" and flimsy, but they are actually quite rugged, and i have never had one break on me. the threaded screw terminals are metal but the rest of the box is plastic. the product has 3 cable holes, one on the top and bottom with rectangular cut outs, easily big enough for a few 2.5mm twin and earth cables with some room for movement. there is also a circular 20mm punch out at the back. the wire hole punch outs come out easily and cleanly with no sharp bits. very good grip on the plaster board unlike some others that I have used in the past that seem to slip around regardless to how tight I did up the screws. the sockets fit very well and sit flat on the wall with no stick off, again unlike some other I have used in the past. Adjustable side grips are very versatile and fit all thickness of plasterboard, 8 to 12 mm is the most common that I come across and it fits fine on all. I also find that sockets sit flat even with plaster board that is a bit warped, which is important to make my work look better when working in old houses with walls that are more wavy than an un ironed shirt. over all great product and good value for money."
"Used plenty of these along with Singles, Dual doubles and Dual Triples in a recent kitchen re-model. Work well, easy to use and install. Nice feature compared with other makes is the Appleby clicks in place and holds against 12mm plaster board which makes locating the screws a lot easier. One note is the side wings need to protrude past the back of the box then slide forward to engage the track, so make sure you have sufficient clearance behind the box when installing."