As the title says. Id be interested to hear the reviews on these products 

i have the shaft, it is a pretty good product.
the main issue is that i do think it loses some power when breaking hard. the shaft is a little more flexible and the wood ferrule a little softer than i would like in a break shaft. i put a samsara j/b tip on a bk2 and i think that was a better shaft for breaking than the ob break. both have good LD performance, not much difference in that department. however, the ob break is definitely not a bad break shaft, it's just a hair behind the bk2. i'd like to see the ob break stiffen the shaft some and perhaps use a ferrule like their classic series.