I would suggest a different combo. There have been posts regarding the internal build quality of the amp (I was given different recommendations on forums). The other thing is that the o2 amp is a bit "outdated." what I mean is that while the o2 is good, there are other amps that are similarly priced but also better. I would say the jds atom has taken the o2's place for now. Same price, better performance. The sdac is still decent, but out of the combo, things like the khadas tone board, topping D10, D30, will give just as amazing performance and value. For combos, a bit more expensive but the topping dx3 is another good choice.