"Antimicrobial" Bathroom Tile?

I have been talking with bath remodelers and noticed almost all of them are dealing/pushing these large tile slabs or "marble-like" composite slabs that are purported to be "antimicrobial." I've seen Microban tile (antimicrobial coating), Puralife, Durabath, etc. I'm not really sure how to evaluate safety. Does anyone have experience with this? Would love to hear about it, thank you!