I did some testing in Sandbox. For our overall use, it doesn't really suit our needs (we're a consumer goods company with over 1400 skus) because of the micromanagement of sku/customer/allocation that was needed.
But I think we'll be using it for special promotions/sales with key customers on specific items/families later this year.
I think it's a first step personally. Once we can csv it, it might be a better option for us.