Your review: I don't use these as wrist bands, i use them for name tags on customer's equipment. The Tyvek is tough stuff, it doesn't rip or tear, it can be written on with a sharpie. The adhesive is great too, once its stuck together, you almost cannot tear them apart, so keep a pair of scissors handy when you need to remove them.
Pros: Price, quality, tear resistant, not affected by water.
Cons: None, for my intended use.