The handle position on the Kapex was designed that way on purpose. It's much more ergonomically correct than the horizontal handles like on my Bosch. Think of it this way, if you are hand sawing and wish to make accurate cuts, you align your lower arm and hand in the same plane as the saw blade. Once you think of it this way, it makes sense, at least if you have much of a hand tool background.
WRT the Bosch, I like mine but when I really want to make accurate cuts for furniture pieces, I sneak into the classroom at work and use the Kapex there. The cut quality is simply superior. IMO, one the best features of the Kapex is the hold down....I'd give a lot for something similar on my Bosch. In the end, they are just tools and whatever works for the individual will be what he or she chooses. That said, IME, showing a customer the cool features of a tool like the Kapex is just a lot of fun.
BTW, Crazy, your point about blade deflection and wobble between a 12" and a 10" saw is spot on. As always, OALA, and YMMV.
Festo Joe
8)
Festool Specialist
Woodcraft of Chattanooga