Myself, I don’t get having two SIM cards on a single phone. Maybe you just want the convenience of having separate numbers for personal and business use without carrying two handsets. If it works for you, it’s all good I guess. Now we have a dual sim watch phone. That may be going a bit far.
The $130 Q8 watch phone has the ability to have 2 numbers simultaneously, with Bluetooth, a 2-megapixel camera, video and audio playback, and a microSD memory card slot. That 1.33″ touchscreen display is going to be a real pain though.