I took Krav Maga for about a year, and I thought it was the most practical form of martial art there is. Not only do you learn to defend yourself in a typical "fist fight" situation, it will also teach you to work against common weapons such as guns, bats, knives, etc. Plus, the strength conditioning is part of the program so you'll be doing a lot of endurance exercises.
There was this sparring system that they used in my Krav Maga classes called "pressure test" where a person would have to defend himself against others with/without weapons in a dark surrounding for a certain amount of time. While it's obviously not as terrifying and nerve-wrecking as in real situations, it still gives you a general idea to what it's like to fight at a constant pace, and how to best observe the surrounding without leaving too much blind-spots and react to attacks as fast as possible.
Though, keep in mind that Krav Maga is also called "Israeli Street Survival" for a pretty damn good reason. If you want the "bold" style of fighting where you want to learn to fight WITH certain regulations (e.g. boxing or even MMA), you will not like Krav Maga at all. Krav Maga teaches you how to dispose of an opponent the fast way possible, even if it means squeezing their eyeballs into the back of their brain, bursting their eardrums, or squashing their balls with your foot.