I used to...for "breakthrough anxiety" on top of my ongoing Klonopin. It was OK. I mean, you can take it just when you need it, cuz it works faster than a lot of other options. Long term...can be addictive, not as addictive as xanax, thank God. If you take it all the time, every day, sometimes you'll get anxiety in between doses. More common with xanax, but can happen with ativan, too. If that happens...you can just take more or switch to klonopin or xanax xr or something.
Ummmm....ideally, only used for 1-4 weeks +/- and then tapered. If its going to be a long term thing, be sure you always have it on you when you travel and also make sure you have refills lined up. Sedative, so...if you're on sedating stuff, be more careful (of course, I would hope your prescriber took this into account).
Ummm.....any benzodiazepine, over the long haul, will cause some degree of dependence. Not always terrible. Most people are OK; some people, it can be hell to taper. Sometimes, depression starts or gets worse because of tranquilizers.