Thanks for writing about this Luke.
I got some SmartCash during their Twitter giveaway. I haven't done anything with it since then, as I have been doing all of my trading on Bitshares DEX and it currently doesn't have SmartCash.
I'll probably just keep the little bit that I have and wait until later to trade it.
If you get at least a 1,000 and store it in the web wallet, you can earn some SmartRewards which is kind of neat.