It doesn't really work for general anxiety, but I personally have a lot of physical symptoms of anxiety -- racing heart, tightness in the chest, pain, etc -- which mimic (but aren't) cardiac symptoms. The propranolol (once or twice a day) completely cuts these out. When the psychological symptoms of anxiety are too much, I have Xanax I can take as needed, but that's only every other day or two.

The only drawback is that it can make me a bit more tired, but only if I'm already quite exhausted. Outside of that, it's virtually side-effect free for me.