Addendum March 2015:
Even after nearly a year of closure still works properly and is tight. The locking mechanism is practical and safe closed by the Metallbüge fuse. I am so far never leaked anything, which I also use daily not the bottle.
Carbonated drinks should not fill, however, because when the closure "under water" is, but Flüsigkeit out can be pressed. As long as the bottle is normal, but nothing happens there first.
The plastic smell is long gone.
I would say long-term test passed, so now 4 instead of 3 stars.