I tried the Guaiac last week. I did the roller ball on the left arm, and the EdP on the right.
The roller ball version seemed stronger than the EdP upon first application but the EdP stuck around longer as a nice light, skin scent. Both smelled of guaiac and rose, pretty straight forward. I preferred the EdP but not enough to fork over $180 for a very small bottle.
I have a sample of Le Labo's Guaiac and that is why I wanted to test red flower's version. Le Labo's IMHO is much, much better.