I have mostly bad experiences with Riverside. Most recently, a relative was there in the ER for a full day. She went in because she was weak and feeling faint and was put into a room to wait most of the day. They said she'd need to have some sort of heart scan and were giving her a special fluid every half hour to make her veins/arteries show up better. When the doctor came in right before the scheduled test, he told her she was being released. When she asked about the test, he replied "Oh, that was for someone else." He told her the fluids would flush right out. I am still concerned about what exactly she drank and what kind of effect it might have on her. I'm sure they'll still charge her for whatever it was!
Someone else I know went in for a throat infection and they wanted to treat her for cancer. All in all, I would avoid it if at all possible!