I had a Mod 24 O/U in .22/20 gauge and it wasn't ideal for my uses, which included grouse and woodcock, jump-shooting ducks along small streams and other small game.
The sights were terrible, the .22LR barrel wasn't that accurate and the 20 gauge barrel threw an extra-full pattern. Because it had a rifle barrel, it was illegal for hunting ducks.
I found it was too slow to cock for flushing grouse.
If I can't be with the rifle I love, I love the rifle I'm with!!