Five stars. Intensified my orgasms, felt like it changed my body chemistry during sex, and made me want more. I wasn't high, but *she* was high. Very interesting feeling. But to each her own; one of my other friends claimed that it didn't do very much for her. Most of the gals I've recommended it to ended up enjoying it as much as I do. One gripe, the design could be improved. You have to spray it at an angle and the nozzle can get leak-y, or ask your partner to, and the clinical-ness of it may detract from the experience.
I couldn't detect a huge change....but I am highly sexual anyway. We've tried it three times and I've not noticed much more than a subtle heightened increase in sensitivity.