I have silicone oven mitts, pot holders, silicone basting brush, silicone cookie sheet (with its own rack so its used on its own), loaf pan, and muffin tins. My dad went silicone crazy with my christmas gifts this year.
I don't like the cookie sheet, it releases the cookies, as well as a funny smell.
I like the muffin tin, but since it only holds 6, I usually use my old nonstick ones. If I spray the tins though, I never have trouble with my muffin pan, so I'm not sure if the silicone has any advantages.
I used the load pan to make baked pasta, and the pan made a funny smell. I can't remember if I've actually baked anything in it though.
I don't really see an advantage to the silicone-definately not as a replacement, but possibly for bakeware you don't already have.
I do like the oven mitts, especially when making spaghetti, I can shove the pasta into the pot without burning myself. But based on using my friend's ove glove, its better for baking.
The baster is probably my favorite thing. Or the pot holders, neither of those are really cookware/bakeware.