Depends on the age of your stock brake hoses.
My old Wira was 7 years old before I swapped to steel braided hoses and the swap was because the hoses expanded a lot each time I pressed the brake pedal which resulted in unresponsive or spongy braking. So in the case of an old worn out hose swap - yes it's useful.
My Myvi on the other hand had it swapped out when the car was just 3 years old and that made no difference whatsoever. The original hoses were still firm and solid so comparing that with the steel hoses didn't really make much of a difference.
There's something you have to be wary of with braided hoses, the wheel arches are the dirtiest parts of the car, stones, dust and all might get stuck between the braiding and over time may cause leaks. You don't want your brakes to leak. So either look for hoses that have a protective coating or keep your wheel arches clean. My Myvi has been on the hoses for 5 years now and my Wira's one is still going strong (cars already sold).