Go through the scams and accusations section here on bitcointalk itself. Read out some reviews there. There will always be one or two scams so don't judge hurriedly generally just 4-5 scams and accusations aren't bad because there are always a few people who feel cheated. check the problems which they faced.

After reading experiences of other I people try out with a very small amount Instead of moving all your money at once. Steadily increase whole money until you are sure and confident that the site is flawless.