Maybe if I heard the 550's before the A900X's I would appreciate them more. But my can history is
Beats Studio --> M50 --> A900X --> K550
The only reason I haven't returned these cans is:
1. I can't. I got em on eBay for $165 new. I made an offer and the seller took it lol.
2. They look pretty nice, and these will probably be my portable can upgrade (from my M50's) once I send these to get modded in order to enable a removable cord
3. They are comfortable as hell. If there are cans that are more comfortable, that wouldn't mean anything to me since I wouldn't know what to do with that additional comfort. I've kept these on for 8 hours straight and thought nothing of it. I get discomfort with the A900X's after ~3-4 hours