I checked it out thinking it was an interesting idea. From my brief research, it seemed like it wasn't even trying to be an open standard, and was completely owned by one company. It also seemed that instead of trying to use it for interesting purposes, it was going to be used for more of the same radio stations, instead of more interesting radio stations, or higher quality audio. Also, "the plan" involved comerciall free music on the extra stations for some time, but not once it started taking off.
If it could reuse the AM bandwidth more efficiently, it's be great, but the main value in that would be for the owners of AM bandwidth, not the radio listeners. If it was an extra twenty bucks and I was buying a head unit, sure, but as it is it seemed like I would be paying royally to enable extra profits for the radio stations.
Matthew