No experience on the Ronix Bill, but I like my 10/11 Harley. It's fast, tons of pop,and lands soft. But that's me, No complaints at all, and going into my 3rd season on it.
If you're set on getting the 13 Harley, by all means get it. But they have not changed the shape on it since it came out in the 10/11 season and you may find it cheaper from the previous years.
Hope this helps.