Regarding the Hasselblad screens, I have an Matte-D in my 501CM with the 45 degree split prism and it's very difficult to use. On the other hand my RZ67 is a breeze to focus so I can definitely relate to what you are saying. I agree 100% in fact. I'm not sure if we just have bum focusing screens or are spoiled by the wonderful RZ screen, but either way I would say the Matte-D screen in my Hasselblad is only about 60% as good as the RZ screen.
So i may give that Beattie Intenscreen, it is very expensive for sure but in all cases if it will help me and give better performance in focusing then it will be all worthy, i don't want to throw my Hasselblad in bag collecting dust for favor to RZ.