I was happy with the
I was happy with the sound of the A90, but the unit I received had a defective (wobbly) volume knob. I returned this unit and asked for a replacement. APOS sat on my return for two weeks before shipping a replacement, which arrived with the same issue. At that point I asked to return the unit for a refund, which APOS denied as it was now slightly outside the 30 day window of the original unit. This was entirely a result of their shipping delay, and I'm very disappointed with APOS' behaviour.