Yes, that's certainly an alternative. A year ago I would ask ... "why buy a heavy, expensive metallic bottle when the standard transparent PET-bottle is so cheap?" - as mentioned, I believe it's a great advantage with a fully transparent bottle. Though, under the regime that the water bottles should be washed on high temperature daily, it's probably the best option - and with daily washing, it's probably not that important that it's transparent.

Metallic bottles may also leak metals, but probably less harmful than plastic anyway. Though ... I think I've heard something about metallic tins and perhaps bottles being lined with plastic ... hm.