Microworkers,Floxter,mturk,ShortTask- Which do u like and which is/are genuine?

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We all know what microworkers site is. Similar to that , there are sites known as Floxter,ShortTask, mturk and may be some others as well..... I have read on hubpages and on other articles , that Short Task is scam. Not all say that, but some have commented in that way.I don't know about Floxter and mturk Now, I want your responses guys... Microworkers is Genuine. What about the other 3 sites. Has any one worked with those sites and got paid or got scammed. I need to know about these 3 sites bfore I work with them, coz I don't want to be fooled at the end after doing a good work sparing my time...