After market headphone cables

I am fairly new to the headphone scene. Just purchased a pair of Sennheiser HD700s for half price on eBay. Not my favorite way to listen but it's the result of a husband spouse thing. I'm sure you get the picture. Anyway, does anyone have experience with after market headphone cables and are they as meaningful as cable upgrades in the rest of my system and worth the expense?
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I bought a headphone aftermarket cable for my Sennheiser HD800s and yes the cable made a noticable imporvement.
You cannot buy another of one like mine whic hwas a limited run from a small cable maker.
But the major brands should be able to do the job.
on TheCableCo site Cardas has earphone cables available with the correct ends for the Sennheisers.
Other brands may also be available with the Sennheiser ends.

PS My HD800s headphones took a LONG time to break in fully.
Yes, the aftermarket cables make a significant improvement. The stock HD800 cable is good but not more than that. When I replaced it with a Moon Audio Blue Dragon everything was improved, especially bass and overall transparency. Treble was clearer but was not any more piercing than with the stock cable.

The improvements were immediately apparent and there were no downsides (except for the price, of course.)
If you want a "budget" option, I have been pleased with the Headphones Lounge cables. They sound very good vs. stock and are less expensive than Moon Audio and Cardas. However, I don't think they offer a 30-day trial period.

Also, instead of spending a lot of money on a headphone cable, you might get much more bang for the buck by upgrading to the HD800 (used, of course.)