I actually never used the D1. I sold it to a buddy before opening it. The O2+ODAC is really good, but IMO it's more a hack job unit. You can either get all the parts and build it yourself, or buy a finished unit from one of many online audio stores. It's a good unit and very portable, but if you only need something for home use, then consider the Schiit Magni/Modi stack. It's around the same price, and definitely more polished.
1/16/16 at 11:36pm