Hi  I don't reckon much to Argus aka-Cartraller I had a load of trouble last year with them,or should I say the hire car company they used out of El Prat "SOLMAR" after loads of promises etc.. phone calls, emails it took me 6 months to get 60/70 euros  compensation for tolls/fuel that was down to unroadworthy hire car, like Smige say,s they are only agents, brokers,
I found it a hell of allot better experience using CENTAURO "I would recommend them" last November, polite, no waiting at airport for pick up ,or having to phone them up WERE ARE YOU !!! good cars, and I only got hammered 20/30 euros for the Full/Empty scam which was less than I expected.
Saying all this, that was out of El Prat and it,s ages since I last hired a car out of Reus so don't know who they use.
It really put a cloud  on that trip, and I will defiantly do the research again before I hire a car. ;)