First of all, it does work and consequently it gives a relatively easy-to-do use for waste paper. However, there are some things of which you should be aware, so that your expectations do not exceed the actuality:
* If I used it as per instructions and compressed with all my strength, I did not have the strength to push the log out of the tube. The solution I found was not to fill it as much -- four double broadsheets gives about the right fill, so that the force required to eject is about the same as the force of compression.
* Be very careful when ejecting the log and ensure that no part of your hand can get caught between the tube and the plunger -- my second log left me with a 1cm diameter blood-blister! Subsequently OK -- once bitten, etc.
* It says that the logs burn for "up to" 30 mins -- expect about half that unless the fire is damped right down.
* The paper logs produce much more ash than wood or eco-logs.
* We have decided that the best use for these paper logs is as kindling/firelighters -- one log, on top of a scrunched up sheet of newspaper, is sufficient to light our woodburner.
Edit, 22 April 2009: I have found that the best "fill" is paper from the shredder. For some reason it can compress down very tight without jamming.