I tried to sell my Theorem 720 (twice) because I found it to be unwieldy. So I was happy using Hidizs AP100 DAP. Then I tried my PM-2 balanced with the Theorem. Wow! Then the PM-3. Wow again. To make the long story short, it is now again my daily commute companion. Who cares if the smartphone-Theorem 720 combo is unwieldy. That SQ on the go is special!