What are super auto flowering seeds?

I was just wanting to know what super auto flowering seeds are as i have just bought some called "Number One" and also "Nirvana Sky". Does anybody know what suoer auto flowering is and if they are anygood seeds? They take roughly 100 from seed to harvest, but isnt this just the same as normal seeds?? They were £28 for "Number One" for 3 seeds and £25 for the "Nirvana Sky" ones for 3 seeds.