someone else needs to try these to make sure i'm not nuts.
They're MUCH bassier than the she3580, and much cleaner at that. TONS of sub bass, with exceptionally clean impact. None of the 10k spike either.
build quality is very much like the SHE3580 - very much a $20 IEM, but the sound is definitely not crap.
Not to mention they come with colored sony hybrid tips!