I dont know if its me or maybe that my music collection is mostly mp3's or that I listen to a lot of streaming (spotify) or that I just havent heard a really high end source dap/amp or what, but I honestly hear pretty little difference between different sources. Right now, I own a chord mojo, and one or two lower end players, like a cayin n3, and an earstudio es100 bluetooth receiver. Between them, differences are always relatively minor. Maybe im just not sensitive to it, but at best, the mojo feels just slightly cleaner, and maybe has better instrument separation and resolution. But its to the point that unless I am doing extremely critical listening, I am usually more than satisfied just listening to streaming audio from my phone directly (a oneplus 5t, not sure what dac it uses). Dont know if I am missing out or if its really all about talking in the margins here.
That said, I find my atlas excellent. Currently on final audio tips, though like others have said, I definitely get driver flex. Not just the popping, but audio tends to go out (left ear mainly) when they are first inserted, but usually seems to clear up relatively quickly. Though I guess thats a bit related to how tight of a seal I get. And it feels tight enough that bass is very present, so I am guessing its enough. Tried out spinfit cp145 for a bit and they also work fine, and maybe open up the treble a bit since they actually have a slightly wider bore than the final audio tips. Though I started getting a bit of a pressure point on my left ear. Still going through my tip rolling for these, mainly just for comfort and ease of use.
My vegas are feeling very neglected and I think they are almost definitely going to be sold on soon...