I bought one of the very first A400 Xplor Unico KO in Canada. It really is an amazing piece of engineering and does everything it promises very well.
But honestly, if I was shopping today, I would consider SX3 or something else. Two personal reasons: first, I am not sure the $1000 worth of extras I paid for over a SX3 are useful to me. Second, it doesn't fit me. Unfortunately, only Remingtons do. My A400 has been sitting in my safe (with only 100 shells through it) for some years.
The moral of the story; if it doesn't fit you, who cares how good of a shotgun it is. You won't be using it often.