It went well and I am even relieved enough to feel pride. It is unusual to find such level of participation and support from our client. More often we encounter a 'Just do it, you will know what's right' and then complaints later on. Not here. It was a lively and businesslike discussion. They liked the prototype very much (I mentioned that the predecessor software is ghastly.) and made lots of minor and very useful suggestions that even solved some of my most urgent problems I still had with the interface.