Full disclosure: I do not own and have never cast a BVK. From the online comments I've seen, though, I've come to two conclusions:

1) The BVK's are the lightest, prettiest, best casting rods TFO has ever produced.

2) They tend to break a lot.

In all fairness, I hear more "I love my BVK" stories than "I broke my BVK" stories. (This thread is typical of that.)

I do hear a lot of breaking stories, though.