Depends what you want to use it for. I've made a mold out of this stuff before. Worked ok, but I would not class myself as a big fan. If you just need a cheap, virtually disposable mold though (especially for casting resin) then it's a lot cheaper than silicone.
I was thinking of using it to make my mask after I finish my sculpt. I've use their silicone before and other then it taking 24hrs to dry I had no complaints. Just wanted to know if anyone has done a pull from there mold with their stuff before?