Cons: picky with source files
this little acorn has an honest, balanced, and natural sound that is very musical and non fatiguing when used at low volume. the stock med tips work for me. highly recommend non-compressed source files with these as their high quality immediately show the flaws of the mp3 format.
Some cans i used to own :
Grado rs1,rs2,hf2,ps500,sr225,custom magnum
various others not worth mentioning.