Our primary focus has been implementing the basic market features you see on SplintX now. Other basic features we have yet to deploy include listing cards for sale, transfer, burn and combine actions.

As far as differentiating goes, we want SplintX to be a Splinterlands hub just as much as it is a market. That means it's a one-stop-shop for all Splinterlands info like: in depth card/player/game/market stats that you can't get anywhere else, how to guides for new players with links to external resources such as hive-engine and then some strategic content for vets. All tied together on a clean, simple interface.

The "ultimate use case" you speak of is our vision of buying and selling in different currencies other than DEC or credits. We'll probably implement the ETH market 1st, with intentions of adding SWAP.HIVE, among other possibilities, down the road.