How old are your Irwins? The one on Amazon has good earlier reviews but reviews in 2013 are bad.
The Klein referenced here is not "automatic"; I don't want to select the correct sized hole (sorry!)
I used to have a plastic el cheapo version and it worked great for few years but eventually it stopped working and now I have lost it.
That "as seen on TV" thing looks promising and if it really works as it is shown in the demo, then I am sold! But I suspect I am going to be extremely disappointed.