Bulldog

IMHO, a 500 recoils more than a 470.

I have a nuber of both in these calibres, all but one that kits and you know the 500's have gone off more than a 470.

R your cons
"No warranty. If something breaks, you will likely have to fix it out of your own pocket which can be $$$$."

If it's checked out properly, you shouldn't have a problems.
A spring may go but unlikely.

"If you don't reload may be a pain to get ammo that shoots to regulation." Same would apply to a new gun - after all, is te ammo they use available in the US at a reasonable price ?
And in shooting over 30 doubles, never had problem with getting all but 1 to shoot and the 1 was because of a loose rib.