I had one.. Liked it.... But took to long to sharpen.
I have 2 grinders now. And for the money, the Timber Tuff (same money I paid for the Timberline) is a lot faster and does a better job.
The Timberline can do a fine job? But you will need to be patient and learn to level and lock it well. Also, starting with a brand new chain (after using it of course) was easier to sharpen and maintain, than some Imhad hand filed.
Again. My personal experience. I ended up giving mine away to a forum member on another Forum. I can do several loops in the time it took to do one with the Timberline. And if you have several loops, you have to take the chain off the bar, put dull chain on, sharpen, repeat. Unless you have a jig set-up?
For the average firewood cutter. This is a fine tool. For someone looking to do numerous chains? Prob not so much.