No issues so far. Have it set on High Gain and it can get plenty loud. No distortion or clipping that I can hear. For reference, my average listening is around 74 dB (ghetto-measured with iPhone mic & app placed at the earcup opening while generating a 500 Hz tone), so I guess it's fine so far for anything + or - 20 dB from that.
Just got it in a day ago and will probably set it up tomorrow. If there's any issues, I'm sure I'll find out real soon. Otherwise, will post some impressions later this week.
Still listening to see if there's any difference, tonality-wise, between this and the AE-7. So far, it's pretty close...