I just went tubeless on my Giant Anthem....and I have had no problems. However I still pack at least two spare tubes because you never know when you may need them. It happened to a buddy. We were about 20 miles out on a shuttle ride in the mountain and he got a double flat in both tubless tires. Come to find out, the Stans had dried up. Then he realized that he didn't have any tubes either, because he was running tubless. Fortunately for him, I was carrying three spares (1 for each wheel and a spare for the spare). Safe to say, 20 mins later we were able to continue on our most epic ride without have to walk someone out.