I'm curious, could you please elaborate on the key differences between the APX 900 and the APX 1000? Are there any notable advancements or upgrades in the APX 1000 that make it stand out from its predecessor, the APX 900? Also, are there any specific features or functionalities that are exclusive to one model over the other? It would be great if you could provide a comprehensive comparison that highlights the distinct characteristics of both these products.