I first had '93 Musar at the recommendation of a server in a restaurant; I described it as Chateauneuf meets Bordeaux (I posted a TN on some wine sites, not sure if it was on this one). I liked it enough to buy a couple bottles.
I bought a couple '94 when I saw them discounted at a wine shop; haven't drunk them yet.
I had read of Musar previously, it having been described by some writers as the finest (or maybe the only good) wine of the Middle East, though I understand there are now some good Israeli ones.
As far as knowing which vintages goes, well, that's the beauty of the internet. There's almost always some wine site that will give you the information you seek, for example
here's a link to a Musar vertical held with the owner . I've read TNs from the gentleman who wrote these, and know him to be quite knowledgeable, so I'd trust his comments. Others are available as well, of course.