Sao Chui can be a great strike in that if you hit a person in the head with it you will literally knock him down if not out.
However, before you actually try to hit someone with Sao Chui there is something you need to do first and that is to condition your forearm. If you don’t then you may hurt your own arm when you hit someone hard.
In Pok Khek Kuen training conditioning the forearm with an iron bar or barbell is a must. Alternatively, you could use a sledge hammer as shown below :-
A suitably weighted sledge hammer can do the job of conditioning your forearms nicely. Its probably cheaper than a barbell plus if you ever need to relieve stress you can use it to go pound a truck tire ……..