I noticed two inconsistencies in Vaadin 7. Ordered layout (vertical, horizontal) seems to insert spacing immediately after inserting a component. Now, consider an HorizontalLayout with two labels, you get something like this:
should not exist and compromises alignement if the layout is right aligned (you see a blank space on right).
The second inconsistency is when you remove all components, (possibly also when you remove some - I did not try), the compenents are removed but spacers remain.
If you systematically replace components you constantly get an increasing space on right (bottom).