Are you using Square Market for your clients?

I like Square in certain circumstances but I think the product has a long way to go until it will displace traditional ecommerce channels. From a discovery mechanism I think it is fantastic but there are a few issues I am waiting to see.

No ability (that I can see) to use your own domain. Essentially you are building Square Market's business, not yours.
Have to use Square. I love using Square for trade shows and clients, but if you are not a high end retailer with decent volume, I have found the traditional merchant providers (here in Hawaii at least) are significantly cheaper compared to square. And on top of it, hard to get a person on the phone if you have an issue compared to the traditional merchant providers.
Far behind the traditional cart providers in functionality. Whether you use BigCommerce, Shopify or go self hosted, cart providers are not only way ahead, but have had third party developers creating applications for them for years.

I gotta give Square credit though. They are pulling a Groupon by trying to lock you into multiple add on services to be able to sell the main. Remember Groupon just started adding merchant services for those that use their coupon service, this is the same thing in the opposite direction.