I bought a toy made out of sili-gel once, before I knew any better. It claimed right on the package that it was phthalate free. Never again! It stunk up my whole room and after I found out how unsafe it was for the body, I threw it away. I've learned there can be false advertising on packaging, just because it says it's phthalate free doesn't mean that it is.
I have noticed that I prefer silicone over glass. One of my favorite dildos is silicone, I love its shape. The funny thing is I have a toy in glass with that same shape that does nothing for me. The two feel nothing alike! It's amazing what a difference materials make!