Yeah, I can't hear any distortion from the DC Aeon RTs. At high volume I feel a slight buzzing sensation but I think that's just my ears being overwhelmed by the sound pressure. They are helping me understand distortion in other speakers/headphones and equipment.
Here's an anecdote, I was using them to A/B compare the Topping NX7 against a decade old Aune 1X desktop DAC with a headphone amplifier and initially I thought the Topping had a bass problem while the Aune sounded more "musical". Listening more critically I discovered that there was bass ringing on loud thumps and while it was very apparent in the Topping it was also there with the Aune but it was getting masked very favorably by perhaps a higher noise floor. I figured the bass must be clipping earlier in the audio chain and eventually figured out it was from poorly implemented EQ in the Hiby player app so I lowered the pregain -6dB on EQ and that fixed the issue. I was able to debug a problem in my audio chain because I could hear what it was doing very clearly.
That's a great example!
For me, low distortion bass is like candy to my baby, but you've got to listen to it differently, with somewhat different values, especially if you're used to dynamic-driver bass with overtones, noise and so forth.
Planar bass can be deeper and more true to the recording, but at first listen can sound thinner in the upper bass / lower mids, or less "rich" compared to resonant bass. Drum strikes can be tonally very accurate, with a timbre that includes the strike but also the sonic ripple of the drumhead, while drum strikes on my HD6XX sound thicker, bolder (more "slam") but more like a hard "thud" than a true drum strike. The planars break out all the components of a recording with complex bass and lower-mids, while the HD6XX's tend to blend the details ... which is annoying to me in direct A/B comparison to the planars, but taken separately in a casual listen, can impart a tonal richness to the dynamic drivers. And so forth.
I find myself making similar comparisons between my Etymotic ER4's, with very detailed balanced-armature drivers, and ER2's, with dynamic drivers. (The ER4's, however, despite being more resolving, don't have the deep bass of planars, nor their EQ flexibility in those low FR bands.)