This thing is great, the flip top lid is great and it doesn't pop open. It looks amazing as well. I go to a college and its nice to have something different than the usual nalgene bottles everyone else has. Also having a smooth lip or whatever its called is sweet to drink from, not something you notice until you get this bottle.
Edit: I had the thing for about 2 weeks, daily use of commuting on transit for college. A crack developed around the main water hole, placed warranty issue on 11/15/2013 will update how warranty issue proceeds
Note: the plastic seems to be quite brittle