Should I upgrade Q10 to 10.3.1.1779?

I finally got notification today (4-21-15) of the update for a Shop Blackberry Q10.
Since it is a backup device, I am queasy about updating now.

My main Q10 is NOT going to be updated because I have heard that a crucial app (Mireo Don't Panic) does not work on 10.3.

Is there any compelling argument for updating my backup device? Thank you.

I would not hesitate to upgrade this backup device. That way, you can see how much nicer 10.3.1 looks over what you have now and how it works. Also, you can try some other apps and see what works and what doesn't. I am surprised that you say Don't Panic doesn't work....really? What doesn't work about it?