Actually the Whistler NXDN upgrade works really well for scanning conventional systems....it's trunk tracking is where it has the main issues.
Judy2 the other alternative is to use software called DSD+ and run it with a tapped scanner or a SDR radio dongle.
But since you're posting in a uniden forum, I too hope they release a NXDN upgrade and soon. Heaven only knows if we'll ever see one based on Unidens 'say nothing and then surprise us' approach (also known as managing the expectations of nobody).