I have a B43 for a drive wheel on one of my bikes and it's very solid, if not a little trendy.

I run it 3x and it is definitely pretty heavy; probably on par w an aerospoke.

From a wheelbuilder's perspective, I didn't like how Velocity didn't take the time to clean out all of the drilling shavings; there was quite a bit in there and I had to spend time with my small needle nose pliers to get it all out, otherwise your risk flatting off it. I also didn't like how you can hear the remnant metal rolling around in there as the wheel turns.

Mine also came from the factory with a smooshed section on the non drive side rim. Could have been from shipping etc, who knows. I don't run it w a brake and I was able to straighten it out, but still, it sucks to get a new wheel with a bend.