I bird hunt at least once a week. It's been that way for nearly ten years. I have debated for several years about getting a dedicated upland gun now that I could potentially afford it. It seems every year before hunting season starts I get the itch and down the rabbit hole of research I go.
So far in all the years I've contemplated it, I end up coming to the same conclusion... My Stoeger M3500 has performed flawlessly in every bird hunting application with the exception of the beginning of dove season (because it only gets cleaned once a year). The Stoeger also has the advantage of going from a Pheasant gun to a goose gun mid hunt by simply switching the shells. That has been quite handy on more than a few occasions.
Everything said above about the issues with break barrel guns is true. You spend good money and hope you don't have any issues or you can spend a ridiculous amount and pray you don't mar the finish. Either way, I think I'd still miss my sling.