I'm usually one of those guys who are visiting so I can offer just a couple of things that are important to me when I do visit.
1. Does the company look like they have the ability to do the job or are they stretching.
2. Do they look like they will be in business for a while.
3. Do they do work for my competition. (sometimes this is good, sometimes bad)
4. Does it look like my job will be a good fit for the company or will our job get lost (we usually have small jobs).