Ordered a DA-9 as it's just the right size to sit nicely on top of a Mac Mini.
I'm sending it straight back due to the constant whee-whee-whee-whee-whee whining sound that you can change the pitch of by adjusting the brightness but can't make go away completely. When the amp is sat on a desktop, there's just too much noise coming from the unit for it to be in any way acceptable. And sorry, but when you buy a brand new unit, you don't want to have to put magic tape on its innards to solve a design flaw, you want it to just work out of the box.
Pity, as it's a very nice-looking unit, and it sounds good too. There is some residual hiss from the speakers, more even than some of my vintage kit puts out, and that's disappointing.