This was our first time trying out a pump, and we used it both on me and on her.
Upside: I have never been so hard and large. We need to get a better cock ring to maintain the bigger erection for longer, but it was a lot of fun. She liked using it on herself, and said it made her more sensitive.
Downside: The bulb was a little harder to squeeze than I expected, and would have been happy if it had been made of a softer rubber. Also, as the pressure inside increased, the bulb took longer and longer to re-inflate.
Conclusion: Definitely a fun toy, but I think we will get a slightly higher tech/higher quality one next time. Very good buy to try out a pump for the first time.