There is no scientific evidence to suggest that back stabbed receptacles are any more prone to failure than side wired. In my career I have replaced hundreds of faulty receptacles and the vast majority were side wired.
It's an urban legend perpetuated by electricians. They would not bear the UL listing label if the backstabbing feature were not safe and effective.
To hear people talk, you'd think that all guys do all day is replace faulty back stabbed receptacles, but everything in our trade goes bad and needs replacing, breakers, fixtures, etc.
As for Wagos and other connectors, I use them but not on the neutrals of multiwire circuits.
No use tempting fate...
[This message has been edited by 1000BaseT (edited 01-19-2007).]
