Yeah, I like it. Kind of like Square Cash for transferring $$, but without dependence on banks.
The others will work fine, but use any crypto you want, so might lead to confusion. Though the versatility would be nice. Promoting Steem is nice too, making a stand-alone more attractive. I suppose it depends on the market and context. And a simple P2P application that isn't web dependent would be even better, for transactions when a signal isn't available. Not sure Bitshares can do that.