Honestly, I like them a lot - enough to buy them at their MSRP which is something I never do (I usually buy used). The problem is they don't isolate enough for me for portable use. If they did I would keep them, as I've been looking for my perfect circumaural portable that sounds good and isolates well.
As for the sound of the Aviators, they have a very open, engaging, natural sound and they scale nicely with an amp. Without an amp, the bass is slightly loose, but never enroaching into the mids. The mids are my favorite part of the headphone, as they're not recessed at all and are very upfront and dynamic (reminds me of a grado without being harsh). No complaints about the highs either - overall it's a very balanced and fun headphone. With an amp, everything is tightened and even more coherent, along with timbre improvement and instruments being very well separated. I prefer the sound of the Aviators to the V6 and M50 if that tells you anything.
If they isolated better, I wouldn't be selling them.