Well, Krav Maga is a great skill to learn. There are a few things to know though. One this is purely a self defense form, there are no competitions for it. The purpose of these skills is to overwhelm the opponent with such potentially lethal force and speed as to end the attack in the shortest time possible by disabling and perhaps even killing the attacker and allowing the defender to flee.
This defense form is commonly taught to special ops people at the federal and military levels. Keep in mind that not every knucklehead with a karate uniform and a belt is qualified to teach this. At present I believe there are only two authorized schools in the United States. To reach the highest level it requires traveling to Israel where the system was invented. Essentially what happened was Israeli special ops people went through all the worlds great martial arts and pulled out the most lethal and powerful moves from the best arts of the world and put them together into a new system. This martial form is especially good for dealing with situations where there are or may be multiple attackers. Keep in mind that this is not a taekwondo / kickboxing for fitness type of art, this art is about playing for keeps.
Although everyone wants to believe their own particular martial art is the most effective, this particular one is generally accepted to be the most lethal form of self defense currently in existence. I would encourage you to continue your research and do some reading from the actually Israeli sites (in english) and some other different sites to get a full view of what this really is. Be careful of anything glamorizing it to be this cool new form of street fighting. Even the military is not teaching this to rank and file personnel, to give you an idea of how strictly this is held. Students are carefully evaluated and only allowed introductory classes until a certain level of maturity and trust are demonstrated because this is precisely the type of thing that does not belong in the hands of street thugs.
Best of luck to you.