I managed to lay my hands on one of the LED Matrix demo boards (traded with a friend) in addition to the 24 bit isolated ADC board I ordered and received.
It's, umm, not fantastic shall we say.
The demo is uninspiring and it doesn't seem to be a particularly useful board at all but, worse, it's now dead.
I loaded the code into an Arduino, it ran, I reset it after making a few changes to get a feel for how it works, it ran and worked how I expected it to.
Then it died, I've not been able to bring it back to life at all, reloaded the original sketch, reset, tried a different Arduino, checked power supplies etc.
It's dead Jim.
Not impressed, so that's one for the bin.