I studied Krav Maga for a year or so at the Dragon Academy in Livonia, Michigan.
I concur with the opinion above. It's a good, solid fighting style that can be learned and assimilated quickly. It's pretty "streetsmart" in that it doesn't have a lot of wasted movement, unnatural stances, or ceremony for its own sake.
If you're looking to be able to defend yourself in a real world situation, it's a good choice. The classes are hard and rewarding, if a bit cheesy at lower levels (music, hand wraps for no apparent reason, etc)
Like many other styles, it's somewhat limited on the ground, and you'll probably need some jiu jitsu/wrestling/judo/whatever if you want to be a rounded fighter.