Since the question starts with the potential buyer "wanting" a double gun, the pool is limited.

I'd say the biggest "problem" facing a potential buyer is justifying the purchase.
Whether it's cost or utility.

There are fabulous guns out there at several price points that will function in casual use for decades.

For a dedicated shooter, not so much.
So, service availability is a real issue. They are going to break in heavy use.

Out there doing it best I can.