I've tried both the stock IE600 cable and cables from other vendors and found that the Null Audio cables have less microphonics and have less of a memory effect (easier to wrap and unwrap). I don't buy into the idea that cables affect sound quality, but I do want a cable that looks good, is comfortable, and is easy to use, and this cable meets all of those criteria.

The cable that increases my listening pleasure.

Received my new cable promptly in a nice case. Build and sound quality is great, and it looks cool too!

Arete Series MKV Premium Upgrade Cable for Headphone | IEM

Solid ergonomic upgrade from the stock Sennheiser IE600/900 cable. Though I can't tell any sonic differences, I bought the cable because the stock one has a gross rubbery sheath, tends to coil instead of drape, and the connectors let the IEMs swivel, which makes them hard to insert. By contrast, this NA cable has snugger-fitting MMCX connectors with little swivel, drapes well, and while I did go for a straight 3.5mm termination instead of a right angle, I'm pleased that the jack has a bit of strain relief. The 1.2m length is perfect for mobile use, and the cable is less microphonic than the stock cable as well.

There are not so many cables fitted well to my N5005. This cable is perfectly fitted.