When screwing the rawplugs in, they tend to break up the surrounding plaster, which drilling and using conventional rawlplugs doesn't do. Some would not screw right in to flush with the wall and it was easy to damage the crosshead at this point. A couple of the screws also had mis-shapen crossheads and could not be used. They seem like a really good idea and I thought they would be quicker, easier and less messy than drilling and using conventional plaster rawlplugs, but in practice, I think I am unlikely to use these very often - the old method is better in the long run. Marginal as to whether they are good quality and value for money therefore.