I had one several years ago on a transit based camper and removed it when I was changing my van. Found I couldn't secure it properly on the post 2006 fiat and it slipped, I eventually sold it. I remember thinking it was expensive but did the job originally. If it fits and you need it then is an ok piece if kit. (I am only 5' 5").
I fitted one a couple of years ago and would not be without it. Find it particularly helpful when in traffic jams and you have to frequently apply the handbrake, saves having to bend so much to reach the lever.
We fitted one on one of our previous Fiat vans because it was a long stretch to reach the handbrake and my wife Gwen who does all the driving has short arms.
It really only takes two minutes to fit or remove.
It does get in the way of rotating the drivers seat a little bit but not enough to outweigh the other advantages.
I think it will not fit the more recent Fiats but details should be on the Kobran web site.