I have tried the Addis brush above, but I found that the stiff bristles were too stiff for standard use and the soft bristles were just a little too soft when compared with the Bentley brush.
I do appreciate the need for a good lightweight all-round brush and at the moment I find that the Bentley is the best there is. I'm still waiting for that Gardiner bloke to get around to bringing out his fantastic new lightweight brush.