I love this name, and I much prefer the spelling Sarina over Serena. It just looks more feminine spelled this way. I would definitely consider using this name for my daughter. It's pretty, feminine, and I like the fact that it’s not very popular or overused.
When I first saw this name I loved it, especially the meaning. But I thought it was pronounced Saarin-a, which I like better than that "Serena" pronounciation, so now I don't like it as much.