It's a lovely piece of wood and well finished Simon but I'm afraid it jars with me a little on the design level too. Because the vase is so elegant and above all curvaceous, I'm wanting to see that echoed and picked up in the base. I agree with Woodpig that the base has slightly too much visual weight but beyond that, I just need to see curves for it to feel integrated with the style of the vase.
Nice idea though, the off centre mini indentation.