I've purchased plenty 99p audio jacks to connect my iPhone to my stereo system but they were always useless. Apart from the fact they'd die after the first use by snapping, the quality of sound was not up to par!
This one has the quality and durability you'd expect if you paid five quid for a cable! Seems quite weird to be this excited over a collection of copper and plastic but it's really not worth buying dozens of cheaper articles when you may as well put the money to proper use!
The sound quality is clearly better; the heads of the cable are tough and are well constructed to keep the cable housed which prevents snagging. Would buy again - but probably wont need to!