I haven't tried the Victoria James textures but they are on my I want to have list. The silicone that I have is a mold by Maureen Carlson. Nothing sticks to it. It takes a little practice to get a good flat backed cast without it sticking to the mold a little. It actually slides around.
I have some rubber texture sheets kind of like a stamp without the backing very flexiable. They are nice but if you don't use a release you will spend some time cleaning your prized half a creation out of the crevices. They are way more flexiable than the SbyS.
I have all the makins clear texture sheets and a couple of the amaco clear plastics. The reason that I have so many of them is simple, when used with water the release well enough, you can use both sides of the plate for an inverse reverse, and they are cheap. For mica shift you can start over without wreaking your clay. If it sticks I start over. These will stick every time if you don't hit them with a spray of water.
I am not sure but I think that Donna Kato's textures are also silicone. They are also on my I want to have list.
I use some stamps depending on the complexity I try to remember to spray them with water. The clear acrylic stamps release pretty good even when I forget.