Single: musicians & creators

I'm able to combine an Album Download with a physical CD that I'm fulfilling in-house (instead of CD Baby, etc.). Combined with the ecommerce capabilities of Shopify, Single Music is freakin' awesome. I can:
+Create discounts.
+Send out free downloads for reviews/networking (well, I guess it costs me $.015, less than postage for a CD).
+ Integrate the product with a marketing campaigns/tools.
I already have an Art/T-shirt brand, so adding music alongside my other products is awesome.
Functionality seamless so far. Support is fast and thorough. Do it.