I own a CFTBL that I recently put a lot of work into after 13 years of use.
https://pinside.com/pinball/forum/topic/my-first-attempt-at-a-restore-cftbl
If your BR and Cyclone are in good condition, I see it as a fair trade. But that's just due to my personal preferences, and not market factors. Cyclone was the pin I played the most when I was a kid so it has even greater sentimental value than my CFTBL, which is the only pin I have ever owned.
The problem is that I just don't have enough room for 2 pins...and my career requires me to move around frequently, so I'm just limited to one pin. For now.
But yeah, I could see myself making such a trade.