I love Kor Water Designs, they just look so cool.
I was pretty much looking for the best looking water bottle that I could find, obviously with decent quality.
I first used the KOR Vida, and I was quite satisfied with it. The Delta was another Kor Water bottle that I was interested so I decided to get this after.
Only "problems" are: a bit of plastic smell in the beginning, but that goes away quickly. The hinge for the lid sometime squeeks when you open / close it. And when you wash it with a sponge, becareful not to use abrasive sponges (or use them softly) because it may leave scratch marks (though not that visible).
But those are tiny problems to be honest. It looks great, spout design is actually really well made, good quality, no smell, no weird taste. In general, does the job while looking great!