If your phone is hard-bricked for it was flashed with wrong firmware?
Only JTAG could revive it in such case, so the service.
If you are not really deeply inloved in your phone, IMHO it isn't worth it, you can have cool phone like Moto G for the same price service would cost probably: quadcore CPU, lots of RAM, fast official updates so far.
tetakpatalked from N7100