Yes, it does.
First of all, Hans does quality work. He has a patent on the barrel back-boring, the shotgun will pattern tighter than any other method of choking, and his shotguns are used by many, many agencies.
You will be happier with your shotgun if he does the work compared to your buying bolt-on parts out of catalogs and doing it yourself. This is the route I would recommend to my friends.
I've got an 870 I bought from him that's first of all a $300 Remington Express, I paid about $800 but then how would I ever get a barrel like that, or have ghost ring sights installed that wouldn't shoot off after a hundred rounds, plus side saddle, extended mag, high visibility follower, extended safety button, etc. Sure, those parts may add up to less than $500 but gunsmithing charges for barrel work and sight installation aren't cheap either.