I just used default settings, and lol....let it wrap itself around Bryce's Trefoil go for a count of 400.....oh, it worked, very well. but the render time is going to take overnight, lol. 

And ditto, with my experience so far, I have found I  had to always do the following;

-Use the flip normals button. Otherwise the ivy ALWAYS grew inside the mesh (also).

-Use the Birth button after growing the ivy, otherwise when I went to export, it would just make a 0kb file and that's it, lol. (live & learn)

VERY cool little app!

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