Hi I am looking at buying one of these second hand and was looking for some feedback on it. 1. Is there any known problem to look out for. 2. Is there a page counter if so how to access it and how many prints are considered low and how many considered high 3. When did they start and stop making them and how to determine the age of the one I am looking at 4. How much were they new and what should be a functioning unit be worth (note I am in Australia) 5. Should I look for something else Thanks Shane