I purchased this as a gift for a coworker and they loved it.
The 4 star rating is because it didn't quite match what I expected by the description.
If you are expecting the unit to light up you may be disappointed. The display appears to consist of a solar cell with the design on it, in front of the solar cell is an LCD panel that turns black and blocks the view of the design. In low light the LCD panel stays clear and the design is visible, in medium to bright light the LCD turns on and off causing the device to alternate (flash) between the design and black.