At $30 - it's worth every penny. The 600ml size is just right (as some people have mentioned, the bigger versions are a bit too heavy/large). The build quality is really high. The magnetic lid just works (although the magnet is not an extremely strong one), the spout allows easy drinking, and the seals are 100% leakproof from my use so far. The vacuum insulation is fantastic too. Keeps drinks cold. Avoids the old problem of a huge amount of condensation on your waterbottle due to the temprature difference. Dry to the touch! Buy one - you won't be disappointed.