The site is really just a place for breeders to list the puppies they have. You would be working with and buying from the breeder, not the site.
We found our teddy bear puppy (shichon is the name for this type of mix) on this site. We have had him for almost 4 years now, and he is wonderful. I spoke on the phone with the breeder a couple times, and she sent pictures every so often so we could see his growth. It was several hours away, so we just drove to pick him up when he was old enough, but I'm sure if we lived closer, we could have visited him.
The site gives you the breeder's name and location, so you could google, or do circuit court or BBB searches, etc, to try to find out any info you can. I am sure that like any place that breeds puppies, you need to watch out for puppy mills.
Good luck in your search!