I have a pair and have been very pleased with them, But I don't use them as a hiking boot. I've been using them as a lwt alpine climbing boot. In that role they certainly last as long or longer than the La Sportiva Trango Evo. LWT mtn boots are made to alst forever. You give up some durability to save weight on any of them. It sounds like yours are "well worn".
I do agree with Alex. If they are really falling apart and it sounds like they are..... I'd bet Salewa would like to see them, keep you as a customer and make you a return customer.