I have to admit I like the design but I dont care for aluminum for the handle material. Its not strength or weight that im worried about. What Im worried about is the tang pin cup area. Aluminum may have a high tensile strength to weight ratio but it dents pretty easy. Anyone who has dropped an aluminum handled knife knows just how bad they can get dinged by a single drop. With high speed intense flipping I worry that the area where the tang pins hit the handles will wear fast and cause the same issues as with a zamak handled knife. I worry about it even more so with the 400 series steel spacers.
One of the reasons the microtech aluminum knives didnt wear out bad is the handles remained light because they used aluminum for the spacers as well. This reduced the impact they made when striking the tang pins. But with Steel spacers putting more weight into the mix thats going to increase the impact the tang pins are going to have on the cups. The MT knives also had some pretty thick tang pins that spread that impact over a wider surface area. But when all is said and done im sure BRS has tested this material thoroughly before endorsing it. And Im sure they designed the tang pins large enough to spread that impact over greater a surface area to decrease wear. Its not BRS's designs i worry about. But rather Bears execution of that design. In other words if the tang cup areas do end up being a problem then I feel its going to be bears fault, not BRS.
I do hope with the use of aluminum we could convince bear to do runs in colors. Id love me a purple 400.
Actually the reason you dont see Ti blades much is due to edge retention. Its very hard to get an edge to last on Ti. You can carbidize it but that only lasts so long. Its used in dive knives where corrosion resistance is preferred over edge retention.