I just did a test switching between the Horizon and WA7 (both using the WA7 as a DAC) I have a hard time telling the difference in sound. To me just "slightly" better bass on the Horizon, but that may because of the tube...they really sound pretty similar driving the HD 700.
I am probably going to be selling my Horizon at some point though, as my desk really needs the space and the WA7 just looks so nice.
interesting to see that the horizon stands up well compared to the WA7
Pity your Horizon is 110v as we are on 230v here and im looking to get one