I recently got the Ninja Thirsti™ 24oz. Travel Bottle, and overall it is a very nice product.  It looks very sleek and stylish.   The bottle is fairly light weight and not to difficult to pack with me.  The little handle is very nice and convenient.   The best part is that it keeps my drinks cold for HOURS.  It was recently 98 degrees where I live, and I had Mountain Dew in my bottle.  I sit outside for over an hour and my drink was still just as cold as when I first poured it.  It works AMAZING!  My only complaint is it is a little bulky and will not fit in any of my cup holders.  But I would definitely recommend this to others.