I don't know if there is any physical different between a stock ECM and an EBR ECM but for someone not capable or willing to modify the eeproms on there stock ECM I think the EBR ECM is great value.
I bought one for my 2010 model 3 years ago when modifying an 08+ ECM was very difficult and I didn't really understand what to do, since then TunerPro RT has been updated and modifying it is now a breeze.
I've now modified my stock ECM with race eeproms, re-sold my EBR ECM and plan on doing some data-logging in the future.