The Raven is made by Rick Kemper, who is widely respected among professional harp makers. His Luchair is very popular among Celtic style players. The Raven uses fluorocarbon strings which some love while others prefer gut. Since Rick until recently was a professional engineer he has not advertised, relying on word of mouth, as Rees does.
While I have not played any of his harps I have had excellent experiences with him when ordering custom sound boxes and sound boards, or in consulting on vintage harp repair. I would absolutely trust him so if you like the Raven, by all means go for it.
Biagio