Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
These 7-segment displays are very useful, very small and with a very good brightness. Leds inside use a common cathode, so you only have to use one resistor to connect the display to your board.
If you are not an expertise and works with Arduino, there is no library to work with it, so you need to manage all the led by yourself.
In my case, I have implemented a simple library to work with this 7-segment display. You can select if it use common cathode or anode and, after that you select the 8 pins of the display. So, finally, I work with this display as an LCD, sendind command like "print" and so on. With this library, I very simple to use.
Summarizing, it works very well and it is a very cheap product.
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