Fit for purpose - good for beginners, not the best though.
By itself, I doubt you will achieve a prostate-orgasm (as a guy), however, if you have a partner, it enhances the pleasure of thrusting. As the vibration comes from the base, you need full insertion to get any effect. This toy another person masturbating you throughout an orgasm means you can have multiple really good orgasms in a row (10 seconds).
First time using a prostate vibrators, it was something I didn't know would be as nice as it was, I've used but plugs before but this is just so much more comfortable and enjoyable.
Bought this for my partner, he loves it. Vibration is loud but the feeling is great.