I really like this so far-- doesn't seem to leak, the external ridges insulate the beverage a bit and make it comfortable to carry when hot, I love that it can be washed in the dishwasher and doesn't have nooks and crannies that hard to clean and where mould can grow. Its form is equally as beautiful as its function!
My only concern is how to keep the rubber seal on the lid clean, I've had issues with other cups in the past growing mould underneath the seal that can't be removed for cleaning. Reviewing a cup after six weeks is a bit silly, as I find that most will show their issues after at least a year, but so far I'm very happy. Would (and have) recommend it!