Absolutely essential - the most cost effective safety device you could buy.

Two of these are absolutely essential.
In use it soon becomes apparent that they are near perfectly designed for the job. The birds-mouth has the functionality and control of a push block but the long handles make them that much safer. They also extend your reach and reduce the need for leaning over the machine which can make many jobs much easier and risk free. Useful for most machine ops, including over the top on a planer. Get two and always have one in each hand wherever possible.
And they are CHEAP!! These are the most cost effective safety devices you can buy.

A must have piece of kit!

It's big and chunky and it may save your fingers or hand one day. An essential for anyone using saws, router tables etc.