The Stihl PA 80 is an extremely effective log splitting tool. Whether you need to split smaller logs or anything up to 20 inches in diameter, this tool will work very effectively for you.
When splitting logs I would suggest that you place the log that you are planning on splitting on top of another log so that when you strike the log the ax doesn't drive through and strike the gravel or cement or whatever surface that you are splitting on.(It can cause the point to dull over time)
Overall, the only problem that I have encountered while using this tool is that when you run into a log that has a knot in it, sometimes it is very difficult to split the log, but I feel that this is typical of all hand held log splitters. This is a very effective log splitter to split all sizes of your logs, but especially the bigger ones. I would highly recommend this tool.
This was the biggest waste of money I ever spent. I was chopping wood with this piece of garbage and the handle split right down the middle before I even got two wheelbarrows full. Considering I paid almost $100 for this thing I was very disappointed. Do not buy this maul!