I remember thinking when I first heard about the Shockwave .410, "Can it chamber/fire .45 Long Colt as well?" then upon learning that it was just an ordinary .410 Shotgun, promptly lost all interest.

If it could fire .45LC then that would actually be pretty cool, especially if it were built strong enough to handle +P loads, but as is, I honestly can't think of a valid reason to own one over either a 20 Gauge variant or a .45/.410 Revolver like the Judge/Govornor/BFR.

Granted that I actually already own a Taurus Judge Magnum, so it's easier for me to dismiss it, but even so, I still can't think of anything the Shockwave .410 could do that couldn't be done better with a combination revolver or the Shockwave 20 Gauge.