Nifty Fifty: The Benefits of a Fixed 50 mm Lens" and I have to say that I totally agree with all what is said there.
If you´re looking for great quality of your photos for low price this lens should be your choice. It costs arround 100 dollars which makes it the cheapest lens on the market but for such a low price you get outsnanding results of your photos.
Because of f1.8 aperture you can take your photos in the places where is not enough light. Lens makes also very good looking bokeh effect.
Let me show you few examples taken with this lens.
And last thin I´d like to mention - the bokeh effect, which is just awesome :)
If you are thinking about buying a new lens and aren´t sure which one would be really useful I can recommend you this one. You won´t regret.