Has anyone tried replacing their Rear leaf springs with Composite leaf springs in order to get more life? I'm just wondering if it is worth the extra cost as I am fed up with replacing the steel ones.

Only vehicle I have with a leaf spring is on our Strada Abarth. Never had any problems with it but I suspect it is different to your leaf spring as it is a sturdy single element.

What car?

In the UK there are specialists that will re-temper steel leaf springs. Hopefully you can find one in Italy too. Leaf springs last a long time, so what are you doing to give them a hard time? Should you instead be looking at a different spec for the type of work it does, or are you suing the wrong vehicle?

Composite springs, designed to replace existing steel ones, would be specified to do the same job. If the use they get is more than expected, they will fail the same as the steel ones.

Tell us more about the vehicle, how long the springs are lasting and what use it is getting.