I can't get over people thinking the m9XX's amp section is "very unimpressive". While it's no Mjolnir 2, for its price point there's a fine-sounding little amp in there with enough power for 99% of the headphones on the market.
Same, I've logged >20k airline miles w/ my Sines and couldn't be happier. People ask about them too. In fact, I ended up having a great conversation about high-end audio with a sheik from the UAE because he was curious about my AK120 II + Sine setup.