I, for one am grateful that it is free! Fits my budget nicely! Since it is free, it does have its idiosyncrasies, but once you learn how it works, its relatively effortless. The video tutorial really does show more than the users guide. For a free program, it does a remarkably good job. The gallery at the website is well worth the visit. And they have added a bonus texture pack for other Ivy leaves.
Do I wish it was easier to use? Absolutely:

• I would love to have better control on where to plant the 'seed' I find the 3 dimensional view very hard to work with and it requires numerous tries and viewing angles to get it where I want it to go.
• Direct control of the camera like I can in Vue to place it exactly where I want it so I can see exactly what I am doing. That constant panning and zooming is a royal pain.
• Scaling imported meshes.
• Not all of my props are at the same scale in my scenes, yet the generator sees them all the same.
• The ability to 'nudge' the growing ivy into certain directions, rather than the random distribution.
• An Undo feature.
• The ability to plant more than one 'seed'
• and so on...

Quote -
If someone were to come out with a better version, I bet they'd get rich quick selling it for $50 - I know the free one is, well, FREE, but it's VERY limited.

-Lew ;-)

...Insert some witty or thought provoking comment here...