I can't speak for all their sales people, but if you go for free with one of them, it's not a "hard sell" trip, but nonetheless it is a sales pitch. If you're interested in buying, you'll have the opportunity to ask questions. Personally I like our sales guy and don't mind hearing his sales pitch.
For the $12, no presentation, trip one can wander on their own. There is a model unit open, but I think they are reluctant to have people tour those without a sales person or unless they are already owners. That said, in Feb the model unit being used was clearly posted at the sales desk. We waited for someone to escort us (we're already owners), but once there the door was open, seems one could have easily checked it out on their own.