These were very interesting in-ear units. M HQ were very interested in them a few years ago (nudge wink).

I had a good listen to the various 1-way, 2-way and 4-way units at the Chiswick Studio headphone jamboree a few years ago. They were really quite excellent.

If I ever start commuting again I will probably get some. The custom in-ear moulding really makes for a very personal product with very high SQ performance.

Rgds,
Nick