Summary: so they worked, but didn't last.
:-( the rubber ear pads would fall off. I was continually looking for the pads. You can buy spares, but only in packs of 5 pairs for $25 from specified Sennheiser dealers. Do poor design that they could fall off.
:-( the strain relief on the connector didn't work. eventually, the cable split under the strain relief. A 'sports' model designed with specific iPhone features should be able to withstand being in a pocket.