I have mixed feelings about Natural Music. Is it a major step down from selector, & Music Master yes! Will it get the job done? Yes.
With my Country, AC & Classic Hits station it works great. My Urban/Hip-Hop on the other hand, it has a hard time with music categories with fewer songs and very high repeat. It has a problem where if I schedule a category 4 times per hour (at :00, :15, :30, :45) the songs will not rotate through all the slots. So for a day a song may schedule at :00, :15, :00, :00, :45, :45, :45. It also has no feature to force current music categories that has no rules move up a hour or back. I tweak and adjust things when I get free time and I have found ways to make things work.
My advice if you just need to get by, then Natural Music will be it. If you need something closer to Selector, then get music master or music 1 looks pretty good, and the support for Music 1 should be great because its written by a radio programmer so they will understand what your trying to do. Natural Music support sometimes makes me want to throw my computer across my office.
Hope this helped.