The biggest question here is the portable source's own power. Will it power the Havi? Also will it match with the Havi?
"Source" have to be good in power. They "scale up" with better sources. That's why I am thinking of purchasing a DX90 nowadays (but have to postpone because of budget).
We have seen people taking this 60 USD iem over their H200, UE900, ie80, gr07 and recently XBA-H3 (preference may be subject to genre type as well).
Personally, I prefer B3 over the KC06 (gold) even without an addition to an amp to the system (excluding Sansa Fuze).
Lack of isolation, lack (or very less) of sound-stage depth (therefore 3D image), slightly more prominent highs, less detail (or definition) on the lower (bass) section killed the KC06 for me... Other than these negatives KC06 is an excellent competitor!
The "shape" and "wents" on the KC06 not only provides poor isolation but also causes leaking of the outside sound in a very unfavorable way (its like putting a limpet (or periwinkle) to your ear and starting to hear the outside noise in a different way...).
So before deciding keep all these in mind.
I hope some of the B3 users other than me will put their input as well
Edited by Baycode - 5/14/14 at 7:01am