I have used 9 of these succesfully with the library and an Uno, the following may help if anyone is considering this to avoid spurious characters and inconsistencies which cause me a few headaches;
Do not daisy chain the Vcc and earth lines futher than 2 modules - supply power to both sides of each module.
Use a capacitor (I used 1000ufd) to decouple power near the chain.
Be aware of the current required >1.5A depending on what is displayed - this needs to be from an external supply not the Uno.
Set the number of drives in the header file - note drive 1 will be the last in the chain.
Other than that these work really well with no flicker during update and a very consistent display
, thanks again for good quality components and a nice library.