I had a friend that asked me to work one over. I bought and installed some Cylinder and slide parts, removed the magazine disconnect, a bunch of stuff. When done, it still wasn't as comfortable to shoot as a worked over CZ. I didn't really like the trigger/sear/hammer setup in that gun very much, and the end result was some additional hand fitting of the aftermarket parts. It was an education, not bad, not exceptional, however. I would take a worked over CZ over a worked over BHP myself. Lots of people like them, however, so maybe my bias in favor of the more oval gripped CZ, sear cage and all, is showing here.
Joe