XV Motorsports core support brace questions

Yet another question from me about beefing the unibody...

I've looked at the XV Motorsports core support brace. I like their box-tubing design over USCarTool's round tube design.

The USCarTool website says their brace must be used in conjunction with a cross-flow radiator, or the lower tank hits.

Anybody have experience with the XV Motorsports box-tube unit?

And, is a core support brace worth the effort?

-Brad