Funny, I have a set of Garbos which i have played the heck out of, and they still sound great after two years. Of course, in the winter there is a problem with tuning when the temp goes from -20c outside to +20c inside. I mean, they are guts, after all. There some sacrifices we have to make. I just now switched to Animas, and i love them, too. They are louder and more exact with their pitch. But loved the thick, warm sound of the Garbos, too. I suspect I'll be swiching back and forth. Of course, if a particular string starts out sounding good, but doesn't please you later on, it could be other problems with the insrument creeping up on you, for instance the sound post could be constricting due to climactic conditions.
Also, these strings won't function well if the bridge is too low!