The format debuted on long-time low-rated KLSY 92.5 Seattle and it greatly improved the ratings of that station (becoming KQMV "Movin' 92.5") instantly (12+ numbers are almost 3x what KLSY had). Of course, every other market immediately started to flip.
It doesn't seem with these formats-of-the-day, people look to see if it is a fit for their market. Seattle is a little unique in that it has no urban AC and one rim-shot Spanish-language FM. The only rhythmic-type station is hip hop KUBE 93.3 there. Since the Movin' format primarily targets black and Hispanic females, and the market is 11% black or Hispanic, I wonder if its success has more to do with it filling a void --- any void --- for those groups who have no real alternatives than it has to do with a huge need to hear Lisa Lisa and the Cult Jam again on the radio. In other words, would a traditional urban AC like KRNB or KSOC here have done just as well on KLSY?
The format doesn't seem to have had the same success in any other place it has been tried yet. Certainly, KMVN in Los Angeles seems to be an enormous failure at this point. Since flipping from country, it has tanked despite signing Rick Dees for mornings and having a lot of publicity. The Riverside country FM (KFRG) is now showing up in the LA ratings with better ratings than KMVN despite not even fully covering LA.