Get EAD, its worth it. In our case for almost a year it was the only US based ID we had as the stupid rednecks in Tennessee stopped giving us driving licenses and instead clubbed us with the illegals, giving us a certificate of driving which was not valid as an ID. Since we didnt like the idea of carrying our passports all the time on our person, the EAD was handy while charging a credit card, boarding a plane or even entering the service center building while going for FP.