Polo Bikes

Is there a reason I don't see many of these as the solution to dual braking? I see many fabricated dualpull levers but not this, is it mostly down to expense?

Mike hasn't mentioned any issues with it yet??? Though I was a little unconvinced by how smooth greased anodised aluminium sliding inside the same would be.. it is neat, if a little costly IMO.
rrrik - Was it adjustability or slippage that put off em and gabes?
em / gabes - comments?