I honestly don't care to get into the frame vs unibody debates. There's not a lot to debate anyway lol. Frames win! The xj unibody isn't like those freakin 2-3 piece ones on cars though. It is at least a "full framed" unibody.
There are two posts on here right now talking about their frames needing replaced. It happens to all of us and there's a lot of work that goes into that too as far as boxing and reinforcing.
I'm just bitching because I can't fab