what are the cons of going through temp agencies?

[SCfuji]

lets say i sign up with four agencies. if its not a job by contract am i free to quit anytime i wish or is ending my job a one-way street?

ie, can i quit a job that one agency gave me and then since i have my name with three others can i use them as sort of backup for quick job turnarounds?

[ThaSaltCracka]

you can give them a few days notice, or simply just say [censored] it, and leave anyways. They are use to that./
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edit: yes.