All I know, Talador, is that I have found that Rob has heard it all, tried most of it at some point or another and settles for the most bang for the buck without fanfare. If you look at the design of the BL and compare it to the high tech high maintenance features of the Greenbird you will appreciate what remains of the latter in the most simple and durable design features of the BL. All else is most likely superfluous.