I have the pen, too. Just got it. I am satisfied with the quality. The image quality is not great, but considering the lens is a pinpoint, it's better than I expected. After all, I'm just using it as a toy.
But I'm surprised that this reviewer said the manual was well-written. I found it anything but; particularly when it came to changing the date and time for the stamps.
Overall, I'd give the product a satisfactory rating, and the documentation a C-.
Also, there's nothing on changing the ink cartridge if and when I need to.