I have started to have a fondness for silicone tubing because of its lack of memory. I dislike that my vinyl tubing, while clear, holds the form it was stored in (and because of limited space I have to coil it). I see that there is an "anti-micobial" PVC tubing available (as well as a mystery thermoplastic tubing).
Besides not being clear, silicone is slightly rougher that vinyl so I imagine not as sanitary. Does anyone know of other tube dangers. Obviously there are phthalates in most plastics/rubbers that let them be flexible. This is less of a concern to me as I'm happy with hormone levels.