Some people will buy anything with a detachable magazine but I dont really see an advantage to this over an extended mag. I would rather have a Saiga semi-auto shotgun.
Extended mag tubes take all day to reload. I’d way rather slap in a fresh mag than dig out a shell, load it, dig out another shell, load it, one by one 10 times. I hear ya on the saiga.
Reloading with a full mag is a lot faster than reloading one loose round at a time.
Good if you really expect to reload in earnest, bulky complication if not.