Difference between purchasing an unlocked BB vs. doing it yourself

Aside from the exterior branding on the device, is there any difference? I travel frequently to the US and may get a local SIM card there to keep roaming costs down. I assumed I would just unlock my Rogers Bold when I get it, but I'd like to make sure there aren't any other limitations.

Thanks

Only difference is cost. Free (DIY) vs whatever you pay to get it done

you can try this it did not work for me howeverhttp://forums.crackberry.com/f3/unlo...-anyone-20002/