I didn't like it at first but I quickly got used to it. If you want to disable it there is a little Live Drag Indicator icon in the lower right corner you can double click. Then it goes back to the old non-wobbly blue line behavior. You can see a demonstration of this in my YouTube video Cartooning with Xara Designer Pro 6 - Part 2 around 0:55. But I wouldn't hesitate to upgrade as the freehand tool is now considerably better than it ever was in past versions, in my opinion, and has increased my productivity.
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