I think you'll be glad you ordered one.
Make sure that you install the driver BEFORE you plug in the USB dongle.
I have five of various types and they make it easy to see what's going on.
I suspect that once you get it running you'll find more uses for it than you originally thought.
The screen capture below shows many of the P25 control channels for the local power company.
You can see them at a glance without having to tune around looking for them.
(The others you see pop up occasionally are paging signals.)