Both of those are junk (BC not as bad as Race Land though). I don't know how you define "worth it", but the stock suspension is better than either of those coilovers in every way. They will handle poorly, ride extremely rough, and wear out quickly (or simply break).
If you want decent coilovers for the track then I recommend RCE Tarmac 2. After installing they should be set up and dialed in by a professional, and I also recommend corner balancing the car at the same time.
"Worth it" definition is right. Maybe he wants coilovers for the "coolness" factor. Then I'd say BCs would certainly work but from what I see on the web, they are not as colorful or pretty as others. I'd look for something that might match the brake caliper color perhaps. But then again, if the tires are rubbing the fenders, one might not even see the coils so it won't matter. :dontknow:
I am using ISC N1 coil overs right now and I love them. I've used raceland ultimos on my A4 and as previously stated, they are absolute garbage. Would rather ride around on blown factory struts lol. The ISC set up is right around 1k...