While the Saiga .410 may be good, possibly one of the biggest flaw with .410 as a whole is the is the lack of quality guns that shoot it. Most are single shot or low-quality pump guns. And as for the low-recoil argument, what's often lost is the fact that .410's are, in fact, single shot or pump guns with little or no padding that expend their full recoil directly into the shooter's shoulder. A 20 gauge pump with a decent recoil pad has less felt recoil than your average .410, no kick for all effective purposes.
I tell recoil-challenged shooters to get a 20 gauge, not a .410. At least the 20 is all-around effective.