Navdoc - I have a CZ(NOT a Brno) in similar 223/12Ga arrangement with a X2.5 w/a scope.
But a home defense gun it is not.
My main use is in varied rough shooting and it is surprisingly accurate and great fun to use...but slow...
Also in countries where licencing is hard on numbers of guns owned, it is 2 in 1 and you have another chance to try for the application to own the big 30cal rifle you desire!
Take my advice and forget the Valmet and get a Winchester P/A Defender 20" barrel 12GA !!
------------------
***Big Bunny***