There are several threads which address these. I personally enjoy doing them. I did one today. They are usually easy, but you have to schedule the visits and some companies play hide and seek after requesting the visits. That I don't understand, because they are the ones who are paying to get approved. Don't count on being able to go when you want in order to connect with other shops. It might take time to contact the contact, and then the visit might be 1 day or 2 days or several weeks off into the future. Make sure that they fee justifies going just there, and maybe you will get lucky and be able to join it with a route. You have to pay for a background check. The cost is a few dollars, and is done on line. They do not reimburse for the background check.
Shopping Southeast Pennsylvania, Delaware above the canal, and South Jersey since 2008