It will depend on the wood

Looking at the pile of wood behind the product is synonymous with a beautiful sweat. Wood corner broke anything alone if a mass is not coming to help.
So the use of wood is easy for very tender starting from a log of a rather average diameter.
When you go to the oak with a good diameter buche, the spark gap explodes himself ... The pointed side base writhed on my own.
For exercise, it's good. But if the goal is to make firewood, repeatedly, it will be wiser to invest in something more substantial, more elaborate. Leborgne - Cleaver of manual logs seems to me interesting feeding mode "elbow grease" ... but I have not tested. I think go electric. It is more expensive but in the long term, ca appears justified.