My concern with entertainment like this is that you don’t want your guests to spend the entire night taking photos -- whether in an old-fashioned booth or the modern day digital set up.
I would recommend limiting a photo booth to cocktail hour so your guests spend the reception time enjoying the meal and dancing the night away.
Have the booth set up and ready to go as your guests enter the cocktail hour and encourage them to use it by locating it in a space they can clearly see and get to. Let the operator know that once the party moves into the reception room they should begin breaking it down, and if guests are to return for their photos have them arranged on a table as they leave at the end of the night.
Whichever style booth you choose props are always a fun way for guests to let loose. For slome creative prop ideas check out Bkyln Bride's list of the Top 10: Photobooth Props