not too bad, but its much better if you've got a dr dre beats jack.
i had my HU out over the weekend and no where for the AUX cable in to go
i ran a 3.5mm jack in my works astra a while back and sound was as good as you would get in from standard apple earphones
What Clio do you have G?
£12 memberships lets you click on this guide titled "Guide for fitting aux/ipod cable to standard headunit"
http://www.cliosport.net/forum/show...ipod-cable-to-standard-headunit&highlight=aux
I believe you must have the "update list" radio/cd player but double check that.