I have several M700's. They were manufactured between the late 60's and early 2000's. I have never had an issue with the triggers in any of them nor have I replaced them. They adjust easily if you know what you are doing and are careful. As with any firearm, they should be pointed in a safe direction any time the safety or action is manipulated.
That being said, if you are leery of the trigger, replace it for your own piece of mind.