Pros: Listen to the music, not the IEMs
Cons: Case is not pocketable
My 1st Customs. I've owned, Coppers, Golds, Shure 530s, IE8s (2 sets), among others stuff. All of the universals I've owned were a hobby. I would play with tips, I would mess with the EQ, I would listen to different IEMs based on the music.
Not bass heavy, but also not bass light. It makes whatever bass is on the recording.
Now that I own these, I don't use anything else. I never even think about them. The music is just pure joy. I can't recommend these more highly. They are one of the best purchases I have ever made. Oddly enough, I think at $1000, they are a better value than my universals at $300.