I own both a 410 and a 115 and do play them together on random occasions (bigger or outdoor stages), though most of the the venues I am playing with the 410 exclusively. I consider myself to be a bit of gear nerd, take my gear very seriously, and I am fully aware of the power handling between the cabs and what that means for efficiency and signal.
I do this mainly because of my pocket book and convenience.
Essentially, I bought my Orange head and Orange 115 cab together used. I wanted a larger/higher powered cab eventually and got a really good deal on the the Orange 410 (for cheaper than what I'd pay new for another 115). So, as mentioned I play the 410 for most shows, but pull the 115 for a little additional horsepower when needed. I know the mismatch is not optimal efficiency, but it is louder, puts my reference tone closer to my ears in larger venues and looks pretty badass in my opinion as a stack.