The ten minutes pass by in a flash and mostly all I had to do was listen.
The usefulness of the feedback was variable. In one case the agent was more interested in getting me to change my WIP into a rewrite of Dorian Gray than in commenting on what I had actually written, which was annoying. Others were more helpful.
The best (and worst) experience I had was having to pitch blind to a commissioning editor because there had been a mess up on communications and she had not received anyone’s work in advance. Know your elevator pitch – you never know when you may need it! It turned out really helpful that had happened, though, because she was very enthusiastic about my idea. She asked me to email her the synopsis and first chapter, as she had not seen it in advance, and gave me some fantastic help and feedback.