Redsy, I only use pushin connections when I have two line outs on recepticles. To me its much cleaner than a pigtail. Tell you the truth though I've never had a recall on any pushin I've done. But have seen others fail.
When I use pushins I always give a little tug to make sure of a good connection.
As far as GFI's the munufacturers have got a good thing going in my opinion, I like the screw down clamps they are using.
