I've been on this for a while. It has helped me immensely in controlling my panic, but like previously said, it does absolutely nothing for the anxious thoughts. I use it PRN, and pretty much everyday, and alter the dosage depending on what kind of situation I will be in. I have noticed though sometimes I need to be careful about using too much, because sometimes it can make me feel light-headed and a little dissociated (because of the drop in blood-pressure). But overall I think it is really useful, it has no major side-effects, and seems much better than other anti-anxiety meds for the physical symptoms. I think it depends on the type of anxiety, if it's more ruminations then it isn't going to be as helpful as if it is used for the outward physiological signs of panic.
One does not abandon, even briefly, one's bed of nails, but is attached to it wherever one goes-William Styron
It's hard enough to live in a land where you don't belong, but knowing it, holding conflicting realities in your head, will drive you mad-Mad Hatter