I was doubtful of this toy and quickly disproven after using it one time.
I enjoy external stimulation, especially clitoral stroking with some firm pressure. This toy delivers that with additional stimulation from firm squishy ridges. I barely get past the first speed level before climaxing. I climax under two minutes using this toy. The Iroha Zen seems like a comparable model in terms of its external focus and stimulating texture.
I think this would be a great couple's toy. I can hold the toy with relative ease. The low rumble also makes it easy to hold in my hand for longer periods of time (when I pace myself). As a sex educator who is constantly holding vibrators, I find it notable that this vibration does not irritate after holding it for more than 20 seconds.
I will close with a brief aesthetic review. It is true to photos. I find it quite attractive and discrete. The charging case keeps the toy clean and offers some deceiving packaging. My roommates thought this was a sculpture! I think it looks a bit like concha bread which is super tasty. I'd say this is an enticing toy for me. I would recommend it (and have) to friends or customers.