It depends on 2 things.
1) How risk-averse are you? Do you check every millimeter of the bungee cord before you jump - with a microscope? Or do you just use a few thick rubber bands and hope for the best?
2) How are you with your devices? Do you give them a lot of usage, handle them roughly and have a lot of them fail? Or do you treat everything like a new toy, babying it and trying to not overuse it?
One other consideration, of course, is how bad, financially, it would be to you to have to pay for a new device in one shot? Although with the new phone plans you can pay for one over many months, so that might not apply.
No one can make these decisions for you.