I second this. I've recently done enterprise purchases of IPS gear. I was very upfront with the vendors. I told them they had to show me how their device performed conducting tasks XXX, YYY, and ZZZ. I told them they could come to my lab and do the tests there, or they could bring me to their lab. I wanted each vendor to have the highest chance of success. In every case, they brought me to their labs.
In hindsight, make them do it at your place. :)
I don't envy you. Simulating a bunch of wireless clients sounds like you'd need some Spirent gear. (Very cool stuff, btw. We just got some)
MJ

My employer took an alternative view: No laptops.

They decided that the extra cost of the devices (compared to desktops) and the security risks make them too much of a risk. So, we don't have any. As for that balance between letting people get things done and security? Well, it doesn't really exist. It's all about security.

Except for all of the managers that have managed to get them. But, that's a different story...