I work for an IT firm, and I end up giving tons of sites an email to use trials, but I dislike doing so just to see a demo. For me, I prefer demos to give me a

I work for an IT firm, and I end up giving tons of sites an email to use trials, but I dislike doing so just to see a demo. For me, I prefer demos to give me an option to contact the company at the end of the demo, but I realize that this may not be terribly helpful to you as I'm not likely to contact you if the demo turned me off for some reason. I would maybe give a place to enter your email address before the demo starts, but make it optional. You could also put a short survey at the end of the demo for feedback. I'm actually fairly likely to fill out a (very) short survey, especially if I didn't like something. The way I see it, I don't want to really risk being inundated with unwanted email from a company, but I'm willing to give my opinion and add an email contact if I think it will be used for improving the product rather than to try advertising to me.