"These fixings are some of the best i've ever used. I have used these for a number of constructional timber projects, and have found them to be accurate, easy driving, and super-strong. No need to drill pilot holes, and the partially threaded shank means they pull up nicely. Not cheap - but you can see why. Can't comment on the corrosion resistance, as the fixings outdoors have only been out one year, but no sign of rust yet...."
"I bought these and some timber drive screws the ones with the bolt head for a project, and these were easily as good, they drive in really smoothly, I used pilot holes but they will drive in without them.
The Torx or TStar head mens no slippage too, expensive but great quality."
"I regularly use timber screws for joist fixing on decking structures. Now Spax have produced these exceptional timber screws I will be using these from now on. The Torx head gives you a good positive driving experience and as usual you can feel the power as the screws drive home. Only down side is they are a little more expensive than other comparable screws but on performance they win hands down in my book."
"A handful of these bad boys was all it took to tighten up a loose staircase from the underside. The long length, large, load speading head, and high strength make them excellent (but not cheap) when nothing else will do."