Salary versus hourly?

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Is it worth being on salary? I have been working a job for two months now that is on salary but I am not sure its really all that its cracked up to be. Sure I get payed for my vacation time but, many more hours are expected of me. What I am asking is if I were hourly any over time would be paid but on salary what I do beyond the time I am suppose to be at work or working I do not get anymore more for. I guess I just wonder which is better?