From their perspective it's probably as reasonable for you to sign their contract as for them to sign yours. That said, you should definitely read and understand what you're signing, suggest revisions before signing, and pass it by a lawyer. I'll admit though, I am comfortable not consulting my lawyer for some things and it can make it easier to negotiate when you can send the contract back immediately with revisions (I've in the past struck parts of overly broad non-competes, agreements to help in any future litigation or patents, agreements to jurisdiction on disputes, gag/disparagement clauses, etc).