I recently sampled Blue Agava and Cacao along with several other Jo Malone scents. I liked it but thought it more appropirate for cooler weather and I'm currently looking for warm weather fragrances. I'm not a big fan of chocolate notes but I liked Blue Agava and Cacao more than the Hanae Mori I owned. I highly recommend testing it. BTW I'll give it another test when I pick up Black Vetyver Cafe in September.
Regarding longevity, I experience about 8-10 hours with the Jo Malone fragrances I own.